mirror of
https://github.com/MariaDB/server.git
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956 lines
31 KiB
Plaintext
956 lines
31 KiB
Plaintext
drop table if exists t1,t2;
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set @sav_dpi= @@div_precision_increment;
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set div_precision_increment= 5;
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show variables like 'div_precision_increment';
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Variable_name Value
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div_precision_increment 5
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create table t1 (grp int, a bigint unsigned, c char(10) not null);
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insert into t1 values (1,1,"a");
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insert into t1 values (2,2,"b");
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insert into t1 values (2,3,"c");
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insert into t1 values (3,4,"E");
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insert into t1 values (3,5,"C");
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insert into t1 values (3,6,"D");
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select a,c,sum(a) from t1 group by a;
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a c sum(a)
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1 a 1
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2 b 2
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3 c 3
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4 E 4
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5 C 5
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6 D 6
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select a,c,sum(a) from t1 where a > 10 group by a;
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a c sum(a)
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select sum(a) from t1 where a > 10;
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sum(a)
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NULL
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select a from t1 order by rand(10);
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a
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2
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6
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1
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3
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5
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4
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select distinct a from t1 order by rand(10);
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a
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2
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6
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1
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3
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5
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4
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select count(distinct a),count(distinct grp) from t1;
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count(distinct a) count(distinct grp)
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6 3
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insert into t1 values (null,null,'');
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select count(distinct a),count(distinct grp) from t1;
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count(distinct a) count(distinct grp)
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6 3
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select sum(all a),count(all a),avg(all a),std(all a),variance(all a),bit_or(all a),bit_and(all a),min(all a),max(all a),min(all c),max(all c) from t1;
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sum(all a) count(all a) avg(all a) std(all a) variance(all a) bit_or(all a) bit_and(all a) min(all a) max(all a) min(all c) max(all c)
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21 6 3.50000 1.70783 2.91667 7 0 1 6 E
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select grp, sum(a),count(a),avg(a),std(a),variance(a),bit_or(a),bit_and(a),min(a),max(a),min(c),max(c) from t1 group by grp;
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grp sum(a) count(a) avg(a) std(a) variance(a) bit_or(a) bit_and(a) min(a) max(a) min(c) max(c)
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NULL NULL 0 NULL NULL NULL 0 18446744073709551615 NULL NULL
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1 1 1 1.00000 0.00000 0.00000 1 1 1 1 a a
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2 5 2 2.50000 0.50000 0.25000 3 2 2 3 b c
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3 15 3 5.00000 0.81650 0.66667 7 4 4 6 C E
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select grp, sum(a)+count(a)+avg(a)+std(a)+variance(a)+bit_or(a)+bit_and(a)+min(a)+max(a)+min(c)+max(c) as sum from t1 group by grp;
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grp sum
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NULL NULL
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1 7
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2 20.25
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3 45.483163247594
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create table t2 (grp int, a bigint unsigned, c char(10));
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insert into t2 select grp,max(a)+max(grp),max(c) from t1 group by grp;
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replace into t2 select grp, a, c from t1 limit 2,1;
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select * from t2;
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grp a c
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NULL NULL
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1 2 a
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2 5 c
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3 9 E
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2 3 c
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drop table t1,t2;
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CREATE TABLE t1 (id int(11),value1 float(10,2));
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INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00);
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CREATE TABLE t2 (id int(11),name char(20));
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INSERT INTO t2 VALUES (1,'Set One'),(2,'Set Two');
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select id, avg(value1), std(value1), variance(value1) from t1 group by id;
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id avg(value1) std(value1) variance(value1)
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1 1.0000000 0.816497 0.666667
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2 11.0000000 0.816497 0.666667
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select name, avg(value1), std(value1), variance(value1) from t1, t2 where t1.id = t2.id group by t1.id;
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name avg(value1) std(value1) variance(value1)
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Set One 1.0000000 0.816497 0.666667
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Set Two 11.0000000 0.816497 0.666667
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drop table t1,t2;
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create table t1 (id int not null);
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create table t2 (id int not null,rating int null);
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insert into t1 values(1),(2),(3);
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insert into t2 values(1, 3),(2, NULL),(2, NULL),(3, 2),(3, NULL);
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select t1.id, avg(rating) from t1 left join t2 on ( t1.id = t2.id ) group by t1.id;
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id avg(rating)
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1 3.00000
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2 NULL
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3 2.00000
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select sql_small_result t2.id, avg(rating) from t2 group by t2.id;
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id avg(rating)
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1 3.00000
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2 NULL
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3 2.00000
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select sql_big_result t2.id, avg(rating) from t2 group by t2.id;
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id avg(rating)
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1 3.00000
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2 NULL
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3 2.00000
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select sql_small_result t2.id, avg(rating+0.0e0) from t2 group by t2.id;
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id avg(rating+0.0e0)
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1 3
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2 NULL
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3 2
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select sql_big_result t2.id, avg(rating+0.0e0) from t2 group by t2.id;
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id avg(rating+0.0e0)
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1 3
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2 NULL
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3 2
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drop table t1,t2;
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create table t1 (a smallint(6) primary key, c char(10), b text);
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INSERT INTO t1 VALUES (1,'1','1');
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INSERT INTO t1 VALUES (2,'2','2');
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INSERT INTO t1 VALUES (4,'4','4');
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select count(*) from t1;
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count(*)
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3
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select count(*) from t1 where a = 1;
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count(*)
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1
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select count(*) from t1 where a = 100;
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count(*)
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0
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select count(*) from t1 where a >= 10;
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count(*)
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0
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select count(a) from t1 where a = 1;
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count(a)
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1
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select count(a) from t1 where a = 100;
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count(a)
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0
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select count(a) from t1 where a >= 10;
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count(a)
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0
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select count(b) from t1 where b >= 2;
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count(b)
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2
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select count(b) from t1 where b >= 10;
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count(b)
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0
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select count(c) from t1 where c = 10;
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count(c)
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0
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drop table t1;
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CREATE TABLE t1 (d DATETIME, i INT);
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INSERT INTO t1 VALUES (NOW(), 1);
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SELECT COUNT(i), i, COUNT(i)*i FROM t1 GROUP BY i;
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COUNT(i) i COUNT(i)*i
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1 1 1
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SELECT COUNT(i), (i+0), COUNT(i)*(i+0) FROM t1 GROUP BY i;
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COUNT(i) (i+0) COUNT(i)*(i+0)
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1 1 1
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DROP TABLE t1;
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create table t1 (
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num float(5,2),
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user char(20)
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);
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insert into t1 values (10.3,'nem'),(20.53,'monty'),(30.23,'sinisa');
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insert into t1 values (30.13,'nem'),(20.98,'monty'),(10.45,'sinisa');
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insert into t1 values (5.2,'nem'),(8.64,'monty'),(11.12,'sinisa');
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select sum(num) from t1;
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sum(num)
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147.58
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select sum(num) from t1 group by user;
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sum(num)
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50.15
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45.63
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51.80
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drop table t1;
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create table t1 (a1 int, a2 char(3), key k1(a1), key k2(a2));
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insert into t1 values(10,'aaa'), (10,null), (10,'bbb'), (20,'zzz');
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create table t2(a1 char(3), a2 int, a3 real, key k1(a1), key k2(a2, a1));
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select * from t1;
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a1 a2
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10 aaa
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10 NULL
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10 bbb
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20 zzz
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select min(a2) from t1;
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min(a2)
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aaa
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select max(t1.a1), max(t2.a2) from t1, t2;
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max(t1.a1) max(t2.a2)
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NULL NULL
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select max(t1.a1) from t1, t2;
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max(t1.a1)
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NULL
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select max(t2.a2), max(t1.a1) from t1, t2;
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max(t2.a2) max(t1.a1)
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NULL NULL
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explain select min(a2) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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explain select max(t1.a1), max(t2.a2) from t1, t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
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insert into t2 values('AAA', 10, 0.5);
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insert into t2 values('BBB', 20, 1.0);
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select t1.a1, t1.a2, t2.a1, t2.a2 from t1,t2;
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a1 a2 a1 a2
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10 aaa AAA 10
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10 aaa BBB 20
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10 NULL AAA 10
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10 NULL BBB 20
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10 bbb AAA 10
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10 bbb BBB 20
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20 zzz AAA 10
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20 zzz BBB 20
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select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9;
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max(t1.a1) max(t2.a1)
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NULL NULL
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select max(t2.a1), max(t1.a1) from t1, t2 where t2.a2=9;
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max(t2.a1) max(t1.a1)
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NULL NULL
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select t1.a1, t1.a2, t2.a1, t2.a2 from t1 left outer join t2 on t1.a1=10;
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a1 a2 a1 a2
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10 aaa AAA 10
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10 aaa BBB 20
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10 NULL AAA 10
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10 NULL BBB 20
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10 bbb AAA 10
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10 bbb BBB 20
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20 zzz NULL NULL
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select max(t1.a2) from t1 left outer join t2 on t1.a1=10;
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max(t1.a2)
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zzz
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select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=20;
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max(t2.a1)
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BBB
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select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=10;
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max(t2.a1)
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AAA
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select max(t2.a1) from t1 left outer join t2 on t1.a2=t2.a1 and 1=0 where t2.a1='AAA';
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max(t2.a1)
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NULL
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select max(t1.a2),max(t2.a1) from t1 left outer join t2 on t1.a1=10;
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max(t1.a2) max(t2.a1)
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zzz BBB
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drop table t1,t2;
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CREATE TABLE t1 (a int, b int);
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select count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1;
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count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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0 NULL NULL NULL NULL NULL 18446744073709551615 0
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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insert into t1 values (1,null);
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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insert into t1 values (1,null);
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insert into t1 values (2,null);
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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2 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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2 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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insert into t1 values (2,1);
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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2 1 1 1.00000 0.00000 1 1 1 1
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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2 1 1 1.00000 0.00000 1 1 1 1
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insert into t1 values (3,1);
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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2 1 1 1.00000 0.00000 1 1 1 1
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3 1 1 1.00000 0.00000 1 1 1 1
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a;
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a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) bit_xor(b)
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1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 0
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2 1 1 1.00000 0.00000 1 1 1 1 1
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3 1 1 1.00000 0.00000 1 1 1 1 1
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explain extended select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using filesort
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Warnings:
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Note 1003 select sql_big_result `test`.`t1`.`a` AS `a`,count(`test`.`t1`.`b`) AS `count(b)`,sum(`test`.`t1`.`b`) AS `sum(b)`,avg(`test`.`t1`.`b`) AS `avg(b)`,std(`test`.`t1`.`b`) AS `std(b)`,min(`test`.`t1`.`b`) AS `min(b)`,max(`test`.`t1`.`b`) AS `max(b)`,bit_and(`test`.`t1`.`b`) AS `bit_and(b)`,bit_or(`test`.`t1`.`b`) AS `bit_or(b)`,bit_xor(`test`.`t1`.`b`) AS `bit_xor(b)` from `test`.`t1` group by `test`.`t1`.`a`
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drop table t1;
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create table t1 (col int);
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insert into t1 values (-1), (-2), (-3);
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select bit_and(col), bit_or(col) from t1;
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bit_and(col) bit_or(col)
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18446744073709551612 18446744073709551615
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select SQL_BIG_RESULT bit_and(col), bit_or(col) from t1 group by col;
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bit_and(col) bit_or(col)
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18446744073709551613 18446744073709551613
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18446744073709551614 18446744073709551614
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18446744073709551615 18446744073709551615
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drop table t1;
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create table t1 (a int);
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select avg(2) from t1;
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avg(2)
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NULL
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drop table t1;
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create table t1(
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a1 char(3) primary key,
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a2 smallint,
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a3 char(3),
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a4 real,
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a5 date,
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key k1(a2,a3),
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key k2(a4 desc,a1),
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key k3(a5,a1)
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);
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create table t2(
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a1 char(3) primary key,
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a2 char(17),
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a3 char(2),
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a4 char(3),
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key k1(a3, a2),
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key k2(a4)
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);
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insert into t1 values('AME',0,'SEA',0.100,date'1942-02-19');
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insert into t1 values('HBR',1,'SEA',0.085,date'1948-03-05');
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insert into t1 values('BOT',2,'SEA',0.085,date'1951-11-29');
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insert into t1 values('BMC',3,'SEA',0.085,date'1958-09-08');
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insert into t1 values('TWU',0,'LAX',0.080,date'1969-10-05');
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insert into t1 values('BDL',0,'DEN',0.080,date'1960-11-27');
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insert into t1 values('DTX',1,'NYC',0.080,date'1961-05-04');
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insert into t1 values('PLS',1,'WDC',0.075,date'1949-01-02');
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insert into t1 values('ZAJ',2,'CHI',0.075,date'1960-06-15');
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insert into t1 values('VVV',2,'MIN',0.075,date'1959-06-28');
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insert into t1 values('GTM',3,'DAL',0.070,date'1977-09-23');
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insert into t1 values('SSJ',null,'CHI',null,date'1974-03-19');
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insert into t1 values('KKK',3,'ATL',null,null);
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insert into t1 values('XXX',null,'MIN',null,null);
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insert into t1 values('WWW',1,'LED',null,null);
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insert into t2 values('TKF','Seattle','WA','AME');
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insert into t2 values('LCC','Los Angeles','CA','TWU');
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insert into t2 values('DEN','Denver','CO','BDL');
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insert into t2 values('SDC','San Diego','CA','TWU');
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insert into t2 values('NOL','New Orleans','LA','GTM');
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insert into t2 values('LAK','Los Angeles','CA','TWU');
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insert into t2 values('AAA','AAA','AA','AME');
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select * from t1;
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a1 a2 a3 a4 a5
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AME 0 SEA 0.1 1942-02-19
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HBR 1 SEA 0.085 1948-03-05
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BOT 2 SEA 0.085 1951-11-29
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BMC 3 SEA 0.085 1958-09-08
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TWU 0 LAX 0.08 1969-10-05
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BDL 0 DEN 0.08 1960-11-27
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DTX 1 NYC 0.08 1961-05-04
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PLS 1 WDC 0.075 1949-01-02
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ZAJ 2 CHI 0.075 1960-06-15
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VVV 2 MIN 0.075 1959-06-28
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GTM 3 DAL 0.07 1977-09-23
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SSJ NULL CHI NULL 1974-03-19
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KKK 3 ATL NULL NULL
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XXX NULL MIN NULL NULL
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WWW 1 LED NULL NULL
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select * from t2;
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a1 a2 a3 a4
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TKF Seattle WA AME
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LCC Los Angeles CA TWU
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|
DEN Denver CO BDL
|
|
SDC San Diego CA TWU
|
|
NOL New Orleans LA GTM
|
|
LAK Los Angeles CA TWU
|
|
AAA AAA AA AME
|
|
explain
|
|
select min(a1) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a1) from t1;
|
|
min(a1)
|
|
AME
|
|
explain
|
|
select max(a4) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a4) from t1;
|
|
max(a4)
|
|
0.1
|
|
explain
|
|
select min(a5), max(a5) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a5), max(a5) from t1;
|
|
min(a5) max(a5)
|
|
1942-02-19 1977-09-23
|
|
explain
|
|
select min(a3) from t1 where a2 = 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where a2 = 2;
|
|
min(a3)
|
|
CHI
|
|
explain
|
|
select min(a1), max(a1) from t1 where a4 = 0.080;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a1), max(a1) from t1 where a4 = 0.080;
|
|
min(a1) max(a1)
|
|
BDL TWU
|
|
explain
|
|
select min(t1.a5), max(t2.a3) from t1, t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(t1.a5), max(t2.a3) from t1, t2;
|
|
min(t1.a5) max(t2.a3)
|
|
1942-02-19 WA
|
|
explain
|
|
select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA';
|
|
min(t1.a3) max(t2.a2)
|
|
DEN San Diego
|
|
explain
|
|
select min(a1) from t1 where a1 > 'KKK';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a1) from t1 where a1 > 'KKK';
|
|
min(a1)
|
|
PLS
|
|
explain
|
|
select min(a1) from t1 where a1 >= 'KKK';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a1) from t1 where a1 >= 'KKK';
|
|
min(a1)
|
|
KKK
|
|
explain
|
|
select max(a3) from t1 where a2 = 2 and a3 < 'SEA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a2 = 2 and a3 < 'SEA';
|
|
max(a3)
|
|
MIN
|
|
explain
|
|
select max(a5) from t1 where a5 < date'1970-01-01';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a5) from t1 where a5 < date'1970-01-01';
|
|
max(a5)
|
|
1969-10-05
|
|
explain
|
|
select max(a3) from t1 where a2 is null;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a2 is null;
|
|
max(a3)
|
|
MIN
|
|
explain
|
|
select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q';
|
|
max(a3)
|
|
LAX
|
|
explain
|
|
select min(a1), max(a1) from t1 where a1 between 'A' and 'P';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a1), max(a1) from t1 where a1 between 'A' and 'P';
|
|
min(a1) max(a1)
|
|
AME KKK
|
|
explain
|
|
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
|
|
max(a3)
|
|
MIN
|
|
explain
|
|
select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
|
|
max(a3)
|
|
MIN
|
|
explain
|
|
select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
|
|
select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
|
|
max(a3)
|
|
NULL
|
|
explain
|
|
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA';
|
|
max(t1.a3) min(t2.a2)
|
|
CHI Los Angeles
|
|
explain
|
|
select max(a3) from t1 where a2 is null and a2 = 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
|
|
select max(a3) from t1 where a2 is null and a2 = 2;
|
|
max(a3)
|
|
NULL
|
|
explain
|
|
select max(a2) from t1 where a2 >= 1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a2) from t1 where a2 >= 1;
|
|
max(a2)
|
|
3
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
|
|
min(a3)
|
|
CHI
|
|
explain
|
|
select min(a3) from t1 where a2 = 4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
|
|
select min(a3) from t1 where a2 = 4;
|
|
min(a3)
|
|
NULL
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
|
|
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
|
|
min(a3)
|
|
NULL
|
|
explain
|
|
select (min(a4)+max(a4))/2 from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select (min(a4)+max(a4))/2 from t1;
|
|
(min(a4)+max(a4))/2
|
|
0.085
|
|
explain
|
|
select min(a3) from t1 where 2 = a2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where 2 = a2;
|
|
min(a3)
|
|
CHI
|
|
explain
|
|
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
|
|
max(a3)
|
|
MIN
|
|
explain
|
|
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
|
|
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
|
|
max(a3)
|
|
NULL
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
|
|
min(a3)
|
|
CHI
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
|
|
min(a3)
|
|
CHI
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
|
|
min(a3)
|
|
MIN
|
|
explain
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
|
|
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
|
|
min(a3)
|
|
NULL
|
|
explain
|
|
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
|
|
min(t1.a1) min(t2.a4)
|
|
AME AME
|
|
explain
|
|
select min(a1) from t1 where a1 > 'KKK' or a1 < 'XXX';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 3 NULL 15 Using where; Using index
|
|
explain
|
|
select min(a1) from t1 where a1 != 'KKK';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 3 NULL 15 Using where; Using index
|
|
explain
|
|
select max(a3) from t1 where a2 < 2 and a3 < 'SEA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range k1 k1 3 NULL 6 Using where; Using index
|
|
explain
|
|
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range k1 k1 7 NULL 1 Using where; Using index
|
|
1 SIMPLE t2 range k1 k1 3 NULL 4 Using where; Using index
|
|
explain
|
|
select min(a4 - 0.01) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k2 12 NULL 15 Using index
|
|
explain
|
|
select max(a4 + 0.01) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k2 12 NULL 15 Using index
|
|
explain
|
|
select min(a3) from t1 where (a2 +1 ) is null;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index
|
|
explain
|
|
select min(a3) from t1 where (a2 + 1) = 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index
|
|
explain
|
|
select min(a3) from t1 where 2 = (a2 + 1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index
|
|
explain
|
|
select min(a2) from t1 where a2 < 2 * a2 - 8;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index
|
|
explain
|
|
select min(a1) from t1 where a1 between a3 and 'KKK';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 15 Using where
|
|
explain
|
|
select min(a4) from t1 where (a4 + 0.01) between 0.07 and 0.08;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL k2 12 NULL 15 Using where; Using index
|
|
explain
|
|
select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 range k2 k2 4 NULL 6 Using where; Using index
|
|
1 SIMPLE t1 index NULL PRIMARY 3 NULL 15 Using index
|
|
drop table t1, t2;
|
|
create table t1 (USR_ID integer not null, MAX_REQ integer not null, constraint PK_SEA_USER primary key (USR_ID)) engine=InnoDB;
|
|
insert into t1 values (1, 3);
|
|
select count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ from t1 group by MAX_REQ;
|
|
count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ
|
|
1
|
|
select Case When Count(*) < MAX_REQ Then 1 Else 0 End from t1 where t1.USR_ID = 1 group by MAX_REQ;
|
|
Case When Count(*) < MAX_REQ Then 1 Else 0 End
|
|
1
|
|
drop table t1;
|
|
create table t1 (a char(10));
|
|
insert into t1 values ('a'),('b'),('c');
|
|
select coercibility(max(a)) from t1;
|
|
coercibility(max(a))
|
|
2
|
|
drop table t1;
|
|
create table t1 (a char character set latin2);
|
|
insert into t1 values ('a'),('b');
|
|
select charset(max(a)), coercibility(max(a)),
|
|
charset(min(a)), coercibility(min(a)) from t1;
|
|
charset(max(a)) coercibility(max(a)) charset(min(a)) coercibility(min(a))
|
|
latin2 2 latin2 2
|
|
show create table t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`a` char(1) character set latin2 default NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
create table t2 select max(a),min(a) from t1;
|
|
show create table t2;
|
|
Table Create Table
|
|
t2 CREATE TABLE `t2` (
|
|
`max(a)` char(1) character set latin2 default NULL,
|
|
`min(a)` char(1) character set latin2 default NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
drop table t2;
|
|
create table t2 select concat(a) from t1;
|
|
show create table t2;
|
|
Table Create Table
|
|
t2 CREATE TABLE `t2` (
|
|
`concat(a)` varchar(1) character set latin2 default NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
drop table t2,t1;
|
|
create table t1 (a int);
|
|
insert into t1 values (1);
|
|
select max(a) as b from t1 having b=1;
|
|
b
|
|
1
|
|
select a from t1 having a=1;
|
|
a
|
|
1
|
|
drop table t1;
|
|
create table t1 (a int);
|
|
select variance(2) from t1;
|
|
variance(2)
|
|
NULL
|
|
select stddev(2) from t1;
|
|
stddev(2)
|
|
NULL
|
|
drop table t1;
|
|
create table t1 (a int);
|
|
insert into t1 values (1),(2);
|
|
prepare stmt1 from 'SELECT COUNT(*) FROM t1';
|
|
execute stmt1;
|
|
COUNT(*)
|
|
2
|
|
execute stmt1;
|
|
COUNT(*)
|
|
2
|
|
execute stmt1;
|
|
COUNT(*)
|
|
2
|
|
deallocate prepare stmt1;
|
|
drop table t1;
|
|
create table t1 (a int, primary key(a));
|
|
insert into t1 values (1),(2);
|
|
prepare stmt1 from 'SELECT max(a) FROM t1';
|
|
execute stmt1;
|
|
max(a)
|
|
2
|
|
execute stmt1;
|
|
max(a)
|
|
2
|
|
execute stmt1;
|
|
max(a)
|
|
2
|
|
deallocate prepare stmt1;
|
|
drop table t1;
|
|
CREATE TABLE t1 (a int primary key);
|
|
INSERT INTO t1 VALUES (1),(2),(3),(4);
|
|
SELECT MAX(a) FROM t1 WHERE a > 5;
|
|
MAX(a)
|
|
NULL
|
|
SELECT MIN(a) FROM t1 WHERE a < 0;
|
|
MIN(a)
|
|
NULL
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (
|
|
id int(10) unsigned NOT NULL auto_increment,
|
|
val enum('one','two','three') NOT NULL default 'one',
|
|
PRIMARY KEY (id)
|
|
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
|
|
INSERT INTO t1 VALUES
|
|
(1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two');
|
|
select val, count(*) from t1 group by val;
|
|
val count(*)
|
|
one 2
|
|
two 2
|
|
three 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
id int(10) unsigned NOT NULL auto_increment,
|
|
val set('one','two','three') NOT NULL default 'one',
|
|
PRIMARY KEY (id)
|
|
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
|
|
INSERT INTO t1 VALUES
|
|
(1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two');
|
|
select val, count(*) from t1 group by val;
|
|
val count(*)
|
|
one 2
|
|
two 2
|
|
three 1
|
|
drop table t1;
|
|
create table t1(a int, b datetime);
|
|
insert into t1 values (1, NOW()), (2, NOW());
|
|
create table t2 select MAX(b) from t1 group by a;
|
|
show create table t2;
|
|
Table Create Table
|
|
t2 CREATE TABLE `t2` (
|
|
`MAX(b)` datetime default NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
drop table t1, t2;
|
|
create table t1(f1 datetime);
|
|
insert into t1 values (now());
|
|
create table t2 select f2 from (select max(now()) f2 from t1) a;
|
|
show columns from t2;
|
|
Field Type Null Key Default Extra
|
|
f2 datetime YES NULL
|
|
drop table t2;
|
|
create table t2 select f2 from (select now() f2 from t1) a;
|
|
show columns from t2;
|
|
Field Type Null Key Default Extra
|
|
f2 datetime NO 0000-00-00 00:00:00
|
|
drop table t2, t1;
|
|
create table t2 (ff double);
|
|
insert into t2 values (2.2);
|
|
select cast(sum(distinct ff) as decimal(5,2)) from t2;
|
|
cast(sum(distinct ff) as decimal(5,2))
|
|
2.20
|
|
select cast(sum(distinct ff) as signed) from t2;
|
|
cast(sum(distinct ff) as signed)
|
|
2
|
|
select cast(variance(ff) as decimal(10,3)) from t2;
|
|
cast(variance(ff) as decimal(10,3))
|
|
0.000
|
|
select cast(min(ff) as decimal(5,2)) from t2;
|
|
cast(min(ff) as decimal(5,2))
|
|
2.20
|
|
create table t1 (df decimal(5,1));
|
|
insert into t1 values(1.1);
|
|
insert into t1 values(2.2);
|
|
select cast(sum(distinct df) as signed) from t1;
|
|
cast(sum(distinct df) as signed)
|
|
3
|
|
select cast(min(df) as signed) from t1;
|
|
cast(min(df) as signed)
|
|
0
|
|
select 1e8 * sum(distinct df) from t1;
|
|
1e8 * sum(distinct df)
|
|
330000000
|
|
select 1e8 * min(df) from t1;
|
|
1e8 * min(df)
|
|
110000000
|
|
create table t3 (ifl int);
|
|
insert into t3 values(1), (2);
|
|
select cast(min(ifl) as decimal(5,2)) from t3;
|
|
cast(min(ifl) as decimal(5,2))
|
|
1.00
|
|
drop table t1, t2, t3;
|
|
CREATE TABLE t1 (id int(11),value1 float(10,2));
|
|
INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00), (2,13.00);
|
|
select id, stddev_pop(value1), var_pop(value1), stddev_samp(value1), var_samp(value1) from t1 group by id;
|
|
id stddev_pop(value1) var_pop(value1) stddev_samp(value1) var_samp(value1)
|
|
1 0.816497 0.666667 1.000000 1.000000
|
|
2 1.118034 1.250000 1.290994 1.666667
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (col1 decimal(16,12));
|
|
INSERT INTO t1 VALUES (-5.00000000001),(-5.00000000002),(-5.00000000003),(-5.00000000000),(-5.00000000001),(-5.00000000002);
|
|
insert into t1 select * from t1;
|
|
select col1,count(col1),sum(col1),avg(col1) from t1 group by col1;
|
|
col1 count(col1) sum(col1) avg(col1)
|
|
-5.000000000030 2 -10.000000000060 -5.00000000003000000
|
|
-5.000000000020 4 -20.000000000080 -5.00000000002000000
|
|
-5.000000000010 4 -20.000000000040 -5.00000000001000000
|
|
-5.000000000000 2 -10.000000000000 -5.00000000000000000
|
|
DROP TABLE t1;
|
|
create table t1 (col1 decimal(16,12));
|
|
insert into t1 values (-5.00000000001);
|
|
insert into t1 values (-5.00000000001);
|
|
select col1,sum(col1),max(col1),min(col1) from t1 group by col1;
|
|
col1 sum(col1) max(col1) min(col1)
|
|
-5.000000000010 -10.000000000020 -5.000000000010 -5.000000000010
|
|
delete from t1;
|
|
insert into t1 values (5.00000000001);
|
|
insert into t1 values (5.00000000001);
|
|
select col1,sum(col1),max(col1),min(col1) from t1 group by col1;
|
|
col1 sum(col1) max(col1) min(col1)
|
|
5.000000000010 10.000000000020 5.000000000010 5.000000000010
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1(
|
|
id int PRIMARY KEY,
|
|
a int,
|
|
b int,
|
|
INDEX i_b_id(a,b,id),
|
|
INDEX i_id(a,id)
|
|
);
|
|
INSERT INTO t1 VALUES
|
|
(1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
|
|
SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
|
|
MAX(id)
|
|
NULL
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1(
|
|
id int PRIMARY KEY,
|
|
a int,
|
|
b int,
|
|
INDEX i_id(a,id),
|
|
INDEX i_b_id(a,b,id)
|
|
);
|
|
INSERT INTO t1 VALUES
|
|
(1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
|
|
SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
|
|
MAX(id)
|
|
NULL
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (a VARCHAR(400));
|
|
INSERT INTO t1 (a) VALUES ("A"), ("a"), ("a "), ("a "),
|
|
("B"), ("b"), ("b "), ("b ");
|
|
SELECT COUNT(DISTINCT a) FROM t1;
|
|
COUNT(DISTINCT a)
|
|
2
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (a int, b int, c int);
|
|
INSERT INTO t1 (a, b, c) VALUES
|
|
(1,1,1), (1,1,2), (1,1,3),
|
|
(1,2,1), (1,2,2), (1,2,3),
|
|
(1,3,1), (1,3,2), (1,3,3),
|
|
(2,1,1), (2,1,2), (2,1,3),
|
|
(2,2,1), (2,2,2), (2,2,3),
|
|
(2,3,1), (2,3,2), (2,3,3),
|
|
(3,1,1), (3,1,2), (3,1,3),
|
|
(3,2,1), (3,2,2), (3,2,3),
|
|
(3,3,1), (3,3,2), (3,3,3);
|
|
SELECT b/c as v, a FROM t1 ORDER BY v;
|
|
v a
|
|
0.33333 3
|
|
0.33333 1
|
|
0.33333 2
|
|
0.50000 1
|
|
0.50000 2
|
|
0.50000 3
|
|
0.66667 2
|
|
0.66667 1
|
|
0.66667 3
|
|
1.00000 3
|
|
1.00000 2
|
|
1.00000 3
|
|
1.00000 1
|
|
1.00000 2
|
|
1.00000 3
|
|
1.00000 2
|
|
1.00000 1
|
|
1.00000 1
|
|
1.50000 3
|
|
1.50000 2
|
|
1.50000 1
|
|
2.00000 1
|
|
2.00000 3
|
|
2.00000 2
|
|
3.00000 3
|
|
3.00000 2
|
|
3.00000 1
|
|
SELECT b/c as v, SUM(a) FROM t1 GROUP BY v;
|
|
v SUM(a)
|
|
0.33333 6
|
|
0.50000 6
|
|
0.66667 6
|
|
1.00000 18
|
|
1.50000 6
|
|
2.00000 6
|
|
3.00000 6
|
|
SELECT SUM(a) FROM t1 GROUP BY b/c;
|
|
SUM(a)
|
|
6
|
|
6
|
|
6
|
|
18
|
|
6
|
|
6
|
|
6
|
|
DROP TABLE t1;
|
|
set div_precision_increment= @sav_dpi;
|