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131 lines
4.0 KiB
Plaintext
131 lines
4.0 KiB
Plaintext
drop table if exists t1,t2;
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create table t1 (a int);
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select count(a) as b from t1 where a=0 having b > 0;
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b
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insert into t1 values (null);
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select count(a) as b from t1 where a=0 having b > 0;
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b
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select count(a) as b from t1 where a=0 having b >=0;
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b
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0
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explain extended select count(a) as b from t1 where a=0 having b >=0;
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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 Impossible WHERE noticed after reading const tables
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Warnings:
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Note 1003 select count(test.t1.a) AS `b` from test.t1 where (test.t1.a = 0) having (count(test.t1.a) >= 0)
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drop table t1;
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CREATE TABLE t1 (
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raw_id int(10) NOT NULL default '0',
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chr_start int(10) NOT NULL default '0',
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chr_end int(10) NOT NULL default '0',
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raw_start int(10) NOT NULL default '0',
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raw_end int(10) NOT NULL default '0',
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raw_ori int(2) NOT NULL default '0'
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);
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INSERT INTO t1 VALUES (469713,1,164123,1,164123,1),(317330,164124,317193,101,153170,1),(469434,317194,375620,101,58527,1),(591816,375621,484273,1,108653,1),(591807,484274,534671,91,50488,1),(318885,534672,649362,101,114791,1),(318728,649363,775520,102,126259,1),(336829,775521,813997,101,38577,1),(317740,813998,953227,101,139330,1),(1,813998,953227,101,139330,1);
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CREATE TABLE t2 (
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id int(10) unsigned NOT NULL default '0',
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contig_id int(10) unsigned NOT NULL default '0',
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seq_start int(10) NOT NULL default '0',
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seq_end int(10) NOT NULL default '0',
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strand tinyint(2) NOT NULL default '0',
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KEY id (id)
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);
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INSERT INTO t2 VALUES (133195,469713,61327,61384,1),(133196,469713,64113,64387,1),(133197,1,1,1,0),(133197,1,1,1,-2);
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SELECT e.id,
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MIN( IF(sgp.raw_ori=1,
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(e.seq_start+sgp.chr_start-sgp.raw_start),
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(sgp.chr_start+sgp.raw_end-e.seq_end))) as start,
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MAX( IF(sgp.raw_ori=1,
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(e.seq_end+sgp.chr_start-sgp.raw_start),
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(sgp.chr_start+sgp.raw_end-e.seq_start))) as end,
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AVG(IF (sgp.raw_ori=1,e.strand,(-e.strand))) as chr_strand
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FROM t1 sgp,
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t2 e
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WHERE sgp.raw_id=e.contig_id
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GROUP BY e.id
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HAVING chr_strand= -1 and end >= 0
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AND start <= 999660;
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id start end chr_strand
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133197 813898 813898 -1.0000
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drop table t1,t2;
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CREATE TABLE t1 (Fld1 int(11) default NULL,Fld2 int(11) default NULL);
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INSERT INTO t1 VALUES (1,10),(1,20),(2,NULL),(2,NULL),(3,50);
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select Fld1, max(Fld2) as q from t1 group by Fld1 having q is not null;
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Fld1 q
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1 20
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3 50
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select Fld1, max(Fld2) from t1 group by Fld1 having max(Fld2) is not null;
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Fld1 max(Fld2)
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1 20
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3 50
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select Fld1, max(Fld2) from t1 group by Fld1 having avg(Fld2) is not null;
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Fld1 max(Fld2)
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1 20
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3 50
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select Fld1, max(Fld2) from t1 group by Fld1 having std(Fld2) is not null;
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Fld1 max(Fld2)
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1 20
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3 50
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select Fld1, max(Fld2) from t1 group by Fld1 having variance(Fld2) is not null;
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Fld1 max(Fld2)
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1 20
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3 50
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drop table t1;
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create table t1 (id int not null, qty int not null);
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insert into t1 values (1,2),(1,3),(2,4),(2,5);
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select id, sum(qty) as sqty from t1 group by id having sqty>2;
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id sqty
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1 5
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2 9
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select sum(qty) as sqty from t1 group by id having count(id) > 0;
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sqty
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5
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9
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select sum(qty) as sqty from t1 group by id having count(distinct id) > 0;
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sqty
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5
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9
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drop table t1;
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CREATE TABLE t1 (
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`id` bigint(20) NOT NULL default '0',
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`description` text
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) ENGINE=MyISAM;
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CREATE TABLE t2 (
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`id` bigint(20) NOT NULL default '0',
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`description` varchar(20)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1, 'test');
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INSERT INTO t2 VALUES (1, 'test');
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CREATE TABLE t3 (
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`id` bigint(20) NOT NULL default '0',
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`order_id` bigint(20) NOT NULL default '0'
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) ENGINE=MyISAM;
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select
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a.id, a.description,
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count(b.id) as c
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from t1 a left join t3 b on a.id=b.order_id
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group by a.id, a.description
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having (a.description is not null) and (c=0);
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id description c
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1 test 0
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select
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a.*,
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count(b.id) as c
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from t2 a left join t3 b on a.id=b.order_id
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group by a.id, a.description
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having (a.description is not null) and (c=0);
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id description c
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1 test 0
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INSERT INTO t1 VALUES (2, 'test2');
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select
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a.id, a.description,
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count(b.id) as c
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from t1 a left join t3 b on a.id=b.order_id
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group by a.id, a.description
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having (a.description is not null) and (c=0);
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id description c
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1 test 0
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2 test2 0
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drop table t1,t2,t3;
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