mirror of
https://github.com/MariaDB/server.git
synced 2025-10-24 07:13:33 +03:00
775 lines
36 KiB
Plaintext
775 lines
36 KiB
Plaintext
drop table if exists t1, t2;
|
||
create table t1 (grp int, a bigint unsigned, c char(10) not null, d char(10) not null);
|
||
insert into t1 values (1,1,"a","a");
|
||
insert into t1 values (2,2,"b","a");
|
||
insert into t1 values (2,3,"c","b");
|
||
insert into t1 values (3,4,"E","a");
|
||
insert into t1 values (3,5,"C","b");
|
||
insert into t1 values (3,6,"D","b");
|
||
insert into t1 values (3,7,"d","d");
|
||
insert into t1 values (3,8,"d","d");
|
||
insert into t1 values (3,9,"D","c");
|
||
select grp,group_concat(c) from t1 group by grp;
|
||
grp group_concat(c)
|
||
1 a
|
||
2 b,c
|
||
3 E,C,D,d,d,D
|
||
explain extended select grp,group_concat(c) from t1 group by grp;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(`test`.`t1`.`c` separator ',') AS `group_concat(c)` from `test`.`t1` group by `test`.`t1`.`grp`
|
||
select grp,group_concat(a,c) from t1 group by grp;
|
||
grp group_concat(a,c)
|
||
1 1a
|
||
2 2b,3c
|
||
3 4E,5C,6D,7d,8d,9D
|
||
select grp,group_concat("(",a,":",c,")") from t1 group by grp;
|
||
grp group_concat("(",a,":",c,")")
|
||
1 (1:a)
|
||
2 (2:b),(3:c)
|
||
3 (4:E),(5:C),(6:D),(7:d),(8:d),(9:D)
|
||
select grp,group_concat(c separator ",") from t1 group by grp;
|
||
grp group_concat(c separator ",")
|
||
1 a
|
||
2 b,c
|
||
3 E,C,D,d,d,D
|
||
select grp,group_concat(c separator "---->") from t1 group by grp;
|
||
grp group_concat(c separator "---->")
|
||
1 a
|
||
2 b---->c
|
||
3 E---->C---->D---->d---->d---->D
|
||
select grp,group_concat(c order by c) from t1 group by grp;
|
||
grp group_concat(c order by c)
|
||
1 a
|
||
2 b,c
|
||
3 C,D,d,d,D,E
|
||
select grp,group_concat(c order by c desc) from t1 group by grp;
|
||
grp group_concat(c order by c desc)
|
||
1 a
|
||
2 c,b
|
||
3 E,D,d,d,D,C
|
||
select grp,group_concat(d order by a) from t1 group by grp;
|
||
grp group_concat(d order by a)
|
||
1 a
|
||
2 a,b
|
||
3 a,b,b,d,d,c
|
||
select grp,group_concat(d order by a desc) from t1 group by grp;
|
||
grp group_concat(d order by a desc)
|
||
1 a
|
||
2 b,a
|
||
3 c,d,d,b,b,a
|
||
select grp,group_concat(a order by a,d+c-ascii(c)-a) from t1 group by grp;
|
||
grp group_concat(a order by a,d+c-ascii(c)-a)
|
||
1 1
|
||
2 2,3
|
||
3 4,5,6,7,8,9
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'c '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'E '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'C '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'D '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'c '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'D '
|
||
select grp,group_concat(a order by d+c-ascii(c),a) from t1 group by grp;
|
||
grp group_concat(a order by d+c-ascii(c),a)
|
||
1 1
|
||
2 3,2
|
||
3 7,8,4,6,9,5
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'c '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'a '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'E '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'C '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'b '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'D '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'd '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'c '
|
||
Warning 1292 Truncated incorrect DOUBLE value: 'D '
|
||
select grp,group_concat(c order by 1) from t1 group by grp;
|
||
grp group_concat(c order by 1)
|
||
1 a
|
||
2 b,c
|
||
3 C,D,d,d,D,E
|
||
select grp,group_concat(distinct c order by c) from t1 group by grp;
|
||
grp group_concat(distinct c order by c)
|
||
1 a
|
||
2 b,c
|
||
3 C,D,E
|
||
select grp,group_concat(distinct c order by c desc) from t1 group by grp;
|
||
grp group_concat(distinct c order by c desc)
|
||
1 a
|
||
2 c,b
|
||
3 E,D,C
|
||
explain extended select grp,group_concat(distinct c order by c desc) from t1 group by grp;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(distinct `test`.`t1`.`c` order by `test`.`t1`.`c` DESC separator ',') AS `group_concat(distinct c order by c desc)` from `test`.`t1` group by `test`.`t1`.`grp`
|
||
select grp,group_concat(c order by c separator ",") from t1 group by grp;
|
||
grp group_concat(c order by c separator ",")
|
||
1 a
|
||
2 b,c
|
||
3 C,D,d,d,D,E
|
||
select grp,group_concat(c order by c desc separator ",") from t1 group by grp;
|
||
grp group_concat(c order by c desc separator ",")
|
||
1 a
|
||
2 c,b
|
||
3 E,D,d,d,D,C
|
||
select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
|
||
grp group_concat(distinct c order by c separator ",")
|
||
1 a
|
||
2 b,c
|
||
3 C,D,E
|
||
explain extended select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(distinct `test`.`t1`.`c` order by `test`.`t1`.`c` ASC separator ',') AS `group_concat(distinct c order by c separator ",")` from `test`.`t1` group by `test`.`t1`.`grp`
|
||
select grp,group_concat(distinct c order by c desc separator ",") from t1 group by grp;
|
||
grp group_concat(distinct c order by c desc separator ",")
|
||
1 a
|
||
2 c,b
|
||
3 E,D,C
|
||
select grp,group_concat(c order by grp desc) from t1 group by grp order by grp;
|
||
grp group_concat(c order by grp desc)
|
||
1 a
|
||
2 c,b
|
||
3 D,d,d,D,C,E
|
||
select grp, group_concat(a separator "")+0 from t1 group by grp;
|
||
grp group_concat(a separator "")+0
|
||
1 1
|
||
2 23
|
||
3 456789
|
||
select grp, group_concat(a separator "")+0.0 from t1 group by grp;
|
||
grp group_concat(a separator "")+0.0
|
||
1 1.0
|
||
2 23.0
|
||
3 456789.0
|
||
select grp, ROUND(group_concat(a separator "")) from t1 group by grp;
|
||
grp ROUND(group_concat(a separator ""))
|
||
1 1
|
||
2 23
|
||
3 456789
|
||
drop table t1;
|
||
create table t1 (grp int, c char(10));
|
||
insert into t1 values (1,NULL),(2,"b"),(2,NULL),(3,"E"),(3,NULL),(3,"D"),(3,NULL),(3,NULL),(3,"D"),(4,""),(5,NULL);
|
||
select grp,group_concat(c order by c) from t1 group by grp;
|
||
grp group_concat(c order by c)
|
||
1 NULL
|
||
2 b
|
||
3 D,D,E
|
||
4
|
||
5 NULL
|
||
set group_concat_max_len = 4;
|
||
select grp,group_concat(c) from t1 group by grp;
|
||
grp group_concat(c)
|
||
1 NULL
|
||
2 b
|
||
3 D,D,
|
||
4
|
||
5 NULL
|
||
Warnings:
|
||
Warning 1260 1 line(s) were cut by GROUP_CONCAT()
|
||
show warnings;
|
||
Level Code Message
|
||
Warning 1260 1 line(s) were cut by GROUP_CONCAT()
|
||
set group_concat_max_len = 1024;
|
||
select group_concat(sum(c)) from t1 group by grp;
|
||
ERROR HY000: Invalid use of group function
|
||
select grp,group_concat(c order by 2) from t1 group by grp;
|
||
ERROR 42S22: Unknown column '2' in 'order clause'
|
||
drop table t1;
|
||
create table t1 ( URL_ID int(11), URL varchar(80));
|
||
create table t2 ( REQ_ID int(11), URL_ID int(11));
|
||
insert into t1 values (4,'www.host.com'), (5,'www.google.com'),(5,'www.help.com');
|
||
insert into t2 values (1,4), (5,4), (5,5);
|
||
select REQ_ID, Group_Concat(URL) as URL from t1, t2 where
|
||
t2.URL_ID = t1.URL_ID group by REQ_ID;
|
||
REQ_ID URL
|
||
1 X
|
||
5 X,X,X
|
||
select REQ_ID, Group_Concat(URL) as URL, Min(t1.URL_ID) urll,
|
||
Max(t1.URL_ID) urlg from t1, t2 where t2.URL_ID = t1.URL_ID group by REQ_ID;
|
||
REQ_ID URL urll urlg
|
||
1 X 4 4
|
||
5 X,X,X 4 5
|
||
drop table t1;
|
||
drop table t2;
|
||
create table t1 (id int, name varchar(16));
|
||
insert into t1 values (1,'longername'),(1,'evenlongername');
|
||
select ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'without distinct: how it should be' from t1;
|
||
without distinct: how it should be
|
||
1:longername,1:evenlongername
|
||
select distinct ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'with distinct: cutoff at length of shortname' from t1;
|
||
with distinct: cutoff at length of shortname
|
||
1:longername,1:evenlongername
|
||
drop table t1;
|
||
create table t1(id int);
|
||
create table t2(id int);
|
||
insert into t1 values(0),(1);
|
||
select group_concat(t1.id) FROM t1,t2;
|
||
group_concat(t1.id)
|
||
NULL
|
||
drop table t1;
|
||
drop table t2;
|
||
create table t1 (bar varchar(32));
|
||
insert into t1 values('test1'),('test2');
|
||
select group_concat(bar order by concat(bar,bar)) from t1;
|
||
group_concat(bar order by concat(bar,bar))
|
||
test1,test2
|
||
select group_concat(bar order by concat(bar,bar) desc) from t1;
|
||
group_concat(bar order by concat(bar,bar) desc)
|
||
test2,test1
|
||
select bar from t1 having group_concat(bar)='';
|
||
bar
|
||
select bar from t1 having instr(group_concat(bar), "test") > 0;
|
||
bar
|
||
test1
|
||
select bar from t1 having instr(group_concat(bar order by concat(bar,bar) desc), "test2,test1") > 0;
|
||
bar
|
||
test1
|
||
drop table t1;
|
||
create table t1 (a int, a1 varchar(10));
|
||
create table t2 (a0 int);
|
||
insert into t1 values (0,"a"),(0,"b"),(1,"c");
|
||
insert into t2 values (1),(2),(3);
|
||
select group_concat(a1 order by (t1.a IN (select a0 from t2))) from t1;
|
||
group_concat(a1 order by (t1.a IN (select a0 from t2)))
|
||
b,a,c
|
||
select group_concat(a1 order by (t1.a)) from t1;
|
||
group_concat(a1 order by (t1.a))
|
||
b,a,c
|
||
drop table t1, t2;
|
||
CREATE TABLE t1 (id1 tinyint(4) NOT NULL, id2 tinyint(4) NOT NULL);
|
||
INSERT INTO t1 VALUES (1, 1),(1, 2),(1, 3),(1, 4),(1, 5),(2, 1),(2, 2),(2, 3);
|
||
CREATE TABLE t2 (id1 tinyint(4) NOT NULL);
|
||
INSERT INTO t2 VALUES (1),(2),(3),(4),(5);
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 AND t1.id1=1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 1,2,3,4,5
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 1,2,3,4,5
|
||
2 1,2,3
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 DESC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 5,4,3,2,1
|
||
2 3,2,1
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 5,4,3,2,1
|
||
2 3,2,1
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2,6-t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 51,42,33,24,15
|
||
2 33,24,15
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2,6-t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 51,42,33,24,15
|
||
2 33,24,15
|
||
SELECT t1.id1, GROUP_CONCAT(t1.id2,"/",6-t1.id2 ORDER BY 1+0,6-t1.id2,t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
|
||
id1 concat_id
|
||
1 5/1,4/2,3/3,2/4,1/5
|
||
2 3/3,2/4,1/5
|
||
drop table t1,t2;
|
||
create table t1 (s1 char(10), s2 int not null);
|
||
insert into t1 values ('a',2),('b',2),('c',1),('a',3),('b',4),('c',4);
|
||
select distinct s1 from t1 order by s2,s1;
|
||
s1
|
||
c
|
||
a
|
||
b
|
||
select group_concat(distinct s1) from t1;
|
||
group_concat(distinct s1)
|
||
a,b,c
|
||
select group_concat(distinct s1 order by s2) from t1 where s2 < 4;
|
||
group_concat(distinct s1 order by s2)
|
||
c,b,a
|
||
select group_concat(distinct s1 order by s2) from t1;
|
||
group_concat(distinct s1 order by s2)
|
||
c,b,a,c
|
||
drop table t1;
|
||
create table t1 (a int, c int);
|
||
insert into t1 values (1, 2), (2, 3), (2, 4), (3, 5);
|
||
create table t2 (a int, c int);
|
||
insert into t2 values (1, 5), (2, 4), (3, 3), (3,3);
|
||
select group_concat(c) from t1;
|
||
group_concat(c)
|
||
2,3,4,5
|
||
select group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1;
|
||
grp
|
||
5,4,3,2
|
||
select group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a)) as grp from t1;
|
||
grp
|
||
5,4,3,2
|
||
select group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a) desc) as grp from t1;
|
||
grp
|
||
2,4,3,5
|
||
select t1.a, group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1 group by 1;
|
||
a grp
|
||
1 2
|
||
2 4,3
|
||
3 5
|
||
select t1.a, group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a)) as grp from t1 group by 1;
|
||
a grp
|
||
1 2
|
||
2 4,3
|
||
3 5
|
||
select t1.a, group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a) desc) as grp from t1 group by 1;
|
||
a grp
|
||
1 2
|
||
2 4,3
|
||
3 5
|
||
select group_concat(c order by (select concat(5-t1.c,group_concat(c order by a)) from t2 where t2.a=t1.a)) as grp from t1;
|
||
grp
|
||
5,4,3,2
|
||
select group_concat(c order by (select concat(t1.c,group_concat(c)) from t2 where a=t1.a)) as grp from t1;
|
||
grp
|
||
2,3,4,5
|
||
select a,c,(select group_concat(c order by a) from t2 where a=t1.a) as grp from t1 order by grp;
|
||
a c grp
|
||
3 5 3,3
|
||
2 3 4
|
||
2 4 4
|
||
1 2 5
|
||
drop table t1,t2;
|
||
CREATE TABLE t1 ( a int );
|
||
CREATE TABLE t2 ( a int );
|
||
INSERT INTO t1 VALUES (1), (2);
|
||
INSERT INTO t2 VALUES (1), (2);
|
||
SELECT GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a) FROM t1, t2 GROUP BY t1.a;
|
||
GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a)
|
||
1,2
|
||
2,4
|
||
DROP TABLE t1, t2;
|
||
CREATE TABLE t1 (a char(4));
|
||
INSERT INTO t1 VALUES ('John'), ('Anna'), ('Bill');
|
||
SELECT GROUP_CONCAT(a SEPARATOR '||') AS names FROM t1
|
||
HAVING names LIKE '%An%';
|
||
names
|
||
John||Anna||Bill
|
||
SELECT GROUP_CONCAT(a SEPARATOR '###') AS names FROM t1
|
||
HAVING LEFT(names, 1) ='J';
|
||
names
|
||
John###Anna###Bill
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 ( a int, b TEXT );
|
||
INSERT INTO t1 VALUES (1,'First Row'), (2,'Second Row');
|
||
SELECT GROUP_CONCAT(b ORDER BY b) FROM t1 GROUP BY a;
|
||
GROUP_CONCAT(b ORDER BY b)
|
||
First Row
|
||
Second Row
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (A_ID INT NOT NULL,A_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID));
|
||
INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ');
|
||
CREATE TABLE t2 (A_ID INT NOT NULL,B_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID,B_DESC));
|
||
INSERT INTO t2 VALUES (1,'A'),(1,'B'),(3,'F');
|
||
SELECT t1.A_ID, GROUP_CONCAT(t2.B_DESC) AS B_DESC FROM t1 LEFT JOIN t2 ON t1.A_ID=t2.A_ID GROUP BY t1.A_ID ORDER BY t1.A_DESC;
|
||
A_ID B_DESC
|
||
1 A,B
|
||
2 NULL
|
||
3 F
|
||
DROP TABLE t1;
|
||
DROP TABLE t2;
|
||
create table t1 (a int, b text);
|
||
insert into t1 values (1, 'bb'), (1, 'ccc'), (1, 'a'), (1, 'bb'), (1, 'ccc');
|
||
insert into t1 values (2, 'BB'), (2, 'CCC'), (2, 'A'), (2, 'BB'), (2, 'CCC');
|
||
select group_concat(b) from t1 group by a;
|
||
group_concat(b)
|
||
bb,ccc,a,bb,ccc
|
||
BB,CCC,A,BB,CCC
|
||
select group_concat(distinct b) from t1 group by a;
|
||
group_concat(distinct b)
|
||
bb,ccc,a
|
||
BB,CCC,A
|
||
select group_concat(b order by b) from t1 group by a;
|
||
group_concat(b order by b)
|
||
a,bb,bb,ccc,ccc
|
||
A,BB,BB,CCC,CCC
|
||
select group_concat(distinct b order by b) from t1 group by a;
|
||
group_concat(distinct b order by b)
|
||
a,bb,ccc
|
||
A,BB,CCC
|
||
set local group_concat_max_len=4;
|
||
select group_concat(b) from t1 group by a;
|
||
group_concat(b)
|
||
bb,c
|
||
BB,C
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(distinct b) from t1 group by a;
|
||
group_concat(distinct b)
|
||
bb,c
|
||
BB,C
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(b order by b) from t1 group by a;
|
||
group_concat(b order by b)
|
||
a,bb
|
||
A,BB
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(distinct b order by b) from t1 group by a;
|
||
group_concat(distinct b order by b)
|
||
a,bb
|
||
A,BB
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
insert into t1 values (1, concat(repeat('1', 300), '2')),
|
||
(1, concat(repeat('1', 300), '2')), (1, concat(repeat('0', 300), '1')),
|
||
(2, concat(repeat('1', 300), '2')), (2, concat(repeat('1', 300), '2')),
|
||
(2, concat(repeat('0', 300), '1'));
|
||
set local group_concat_max_len=1024;
|
||
select group_concat(b) from t1 group by a;
|
||
group_concat(b)
|
||
bb,ccc,a,bb,ccc,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
|
||
BB,CCC,A,BB,CCC,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
|
||
select group_concat(distinct b) from t1 group by a;
|
||
group_concat(distinct b)
|
||
bb,ccc,a,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
|
||
BB,CCC,A,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
|
||
select group_concat(b order by b) from t1 group by a;
|
||
group_concat(b order by b)
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,a,bb,bb,ccc,ccc
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,A,BB,BB,CCC,CCC
|
||
select group_concat(distinct b order by b) from t1 group by a;
|
||
group_concat(distinct b order by b)
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,a,bb,ccc
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,A,BB,CCC
|
||
set local group_concat_max_len=400;
|
||
select group_concat(b) from t1 group by a;
|
||
group_concat(b)
|
||
bb,ccc,a,bb,ccc,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
BB,CCC,A,BB,CCC,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(distinct b) from t1 group by a;
|
||
group_concat(distinct b)
|
||
bb,ccc,a,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||
BB,CCC,A,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(b order by b) from t1 group by a;
|
||
group_concat(b order by b)
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
select group_concat(distinct b order by b) from t1 group by a;
|
||
group_concat(distinct b order by b)
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
|
||
Warnings:
|
||
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
||
drop table t1;
|
||
create table t1 (a varchar(255) character set cp1250 collate cp1250_general_ci,
|
||
b varchar(255) character set koi8r);
|
||
insert into t1 values ('xxx','yyy');
|
||
select collation(a) from t1;
|
||
collation(a)
|
||
cp1250_general_ci
|
||
select collation(group_concat(a)) from t1;
|
||
collation(group_concat(a))
|
||
cp1250_general_ci
|
||
create table t2 select group_concat(a) as a from t1;
|
||
show create table t2;
|
||
Table Create Table
|
||
t2 CREATE TABLE `t2` (
|
||
`a` varchar(400) CHARACTER SET cp1250 DEFAULT NULL
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
||
select collation(group_concat(a,_koi8r'test')) from t1;
|
||
collation(group_concat(a,_koi8r'test'))
|
||
cp1250_general_ci
|
||
select collation(group_concat(a,_koi8r 0xC1C2)) from t1;
|
||
ERROR HY000: Illegal mix of collations (cp1250_general_ci,IMPLICIT) and (koi8r_general_ci,COERCIBLE) for operation 'group_concat'
|
||
select collation(group_concat(a,b)) from t1;
|
||
ERROR HY000: Illegal mix of collations (cp1250_general_ci,IMPLICIT) and (koi8r_general_ci,IMPLICIT) for operation 'group_concat'
|
||
drop table t1;
|
||
drop table t2;
|
||
CREATE TABLE t1 (a CHAR(10) CHARACTER SET cp850);
|
||
INSERT INTO t1 VALUES ('<27>');
|
||
SELECT a FROM t1;
|
||
a
|
||
<EFBFBD>
|
||
SELECT GROUP_CONCAT(a) FROM t1;
|
||
GROUP_CONCAT(a)
|
||
<EFBFBD>
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (id int);
|
||
SELECT GROUP_CONCAT(id) AS gc FROM t1 HAVING gc IS NULL;
|
||
gc
|
||
NULL
|
||
DROP TABLE t1;
|
||
create table t2 (a int, b int);
|
||
insert into t2 values (1,1), (2,2);
|
||
select b x, (select group_concat(x) from t2) from t2;
|
||
x (select group_concat(x) from t2)
|
||
1 1,1
|
||
2 2,2
|
||
drop table t2;
|
||
create table t1 (d int not null auto_increment,primary key(d), a int, b int, c int);
|
||
insert into t1(a,b) values (1,3), (1,4), (1,2), (2,7), (1,1), (1,2), (2,3), (2,3);
|
||
select d,a,b from t1 order by a;
|
||
d a b
|
||
1 1 3
|
||
2 1 4
|
||
3 1 2
|
||
5 1 1
|
||
6 1 2
|
||
4 2 7
|
||
7 2 3
|
||
8 2 3
|
||
explain select a, group_concat(b) from t1 group by a with rollup;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using filesort
|
||
select a, group_concat(b) from t1 group by a with rollup;
|
||
a group_concat(b)
|
||
1 3,4,2,1,2
|
||
2 7,3,3
|
||
NULL 3,4,2,1,2,7,3,3
|
||
select a, group_concat(distinct b) from t1 group by a with rollup;
|
||
a group_concat(distinct b)
|
||
1 3,4,2,1
|
||
2 7,3
|
||
NULL 3,4,2,1,7
|
||
select a, group_concat(b order by b) from t1 group by a with rollup;
|
||
a group_concat(b order by b)
|
||
1 1,2,2,3,4
|
||
2 3,3,7
|
||
NULL 1,2,2,3,3,3,4,7
|
||
select a, group_concat(distinct b order by b) from t1 group by a with rollup;
|
||
a group_concat(distinct b order by b)
|
||
1 1,2,3,4
|
||
2 3,7
|
||
NULL 1,2,3,4,7
|
||
drop table t1;
|
||
create table t1 (a char(3), b char(20), primary key (a, b));
|
||
insert into t1 values ('ABW', 'Dutch'), ('ABW', 'English');
|
||
select group_concat(a) from t1 group by b;
|
||
group_concat(a)
|
||
ABW
|
||
ABW
|
||
drop table t1;
|
||
CREATE TABLE t1 (
|
||
aID smallint(5) unsigned NOT NULL auto_increment,
|
||
sometitle varchar(255) NOT NULL default '',
|
||
bID smallint(5) unsigned NOT NULL,
|
||
PRIMARY KEY (aID),
|
||
UNIQUE KEY sometitle (sometitle)
|
||
);
|
||
INSERT INTO t1 SET sometitle = 'title1', bID = 1;
|
||
INSERT INTO t1 SET sometitle = 'title2', bID = 1;
|
||
CREATE TABLE t2 (
|
||
bID smallint(5) unsigned NOT NULL auto_increment,
|
||
somename varchar(255) NOT NULL default '',
|
||
PRIMARY KEY (bID),
|
||
UNIQUE KEY somename (somename)
|
||
);
|
||
INSERT INTO t2 SET somename = 'test';
|
||
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
FROM t1 JOIN t2 ON t1.bID = t2.bID;
|
||
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
2 test
|
||
INSERT INTO t2 SET somename = 'test2';
|
||
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
FROM t1 JOIN t2 ON t1.bID = t2.bID;
|
||
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
2 test
|
||
DELETE FROM t2 WHERE somename = 'test2';
|
||
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
FROM t1 JOIN t2 ON t1.bID = t2.bID;
|
||
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
|
||
2 test
|
||
DROP TABLE t1,t2;
|
||
select * from (select group_concat('c') from DUAL) t;
|
||
group_concat('c')
|
||
c
|
||
create table t1 ( a int not null default 0);
|
||
select * from (select group_concat(a) from t1) t2;
|
||
group_concat(a)
|
||
NULL
|
||
select group_concat('x') UNION ALL select 1;
|
||
group_concat('x')
|
||
x
|
||
1
|
||
drop table t1;
|
||
CREATE TABLE t1 (id int, a varchar(9));
|
||
INSERT INTO t1 VALUES
|
||
(2, ''), (1, ''), (2, 'x'), (1, 'y'), (3, 'z'), (3, '');
|
||
SELECT GROUP_CONCAT(a) FROM t1;
|
||
GROUP_CONCAT(a)
|
||
,,x,y,z,
|
||
SELECT GROUP_CONCAT(a ORDER BY a) FROM t1;
|
||
GROUP_CONCAT(a ORDER BY a)
|
||
,,,x,y,z
|
||
SELECT GROUP_CONCAT(a) FROM t1 GROUP BY id;
|
||
GROUP_CONCAT(a)
|
||
,y
|
||
,x
|
||
z,
|
||
SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY id;
|
||
GROUP_CONCAT(a ORDER BY a)
|
||
,y
|
||
,x
|
||
,z
|
||
DROP TABLE t1;
|
||
create table t1(f1 int);
|
||
insert into t1 values(1),(2),(3);
|
||
select f1, group_concat(f1+1) from t1 group by f1 with rollup;
|
||
f1 group_concat(f1+1)
|
||
1 2
|
||
2 3
|
||
3 4
|
||
NULL 2,3,4
|
||
select count(distinct (f1+1)) from t1 group by f1 with rollup;
|
||
count(distinct (f1+1))
|
||
1
|
||
1
|
||
1
|
||
3
|
||
drop table t1;
|
||
create table t1 (f1 int unsigned, f2 varchar(255));
|
||
insert into t1 values (1,repeat('a',255)),(2,repeat('b',255));
|
||
select f2,group_concat(f1) from t1 group by f2;
|
||
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
|
||
def test t1 t1 f2 f2 253 255 255 Y 0 0 8
|
||
def group_concat(f1) 253 400 1 Y 128 0 63
|
||
f2 group_concat(f1)
|
||
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1
|
||
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb 2
|
||
drop table t1;
|
||
set names latin1;
|
||
create table t1 (a char, b char);
|
||
insert into t1 values ('a', 'a'), ('a', 'b'), ('b', 'a'), ('b', 'b');
|
||
create table t2 select group_concat(b) as a from t1 where a = 'a';
|
||
create table t3 (select group_concat(a) as a from t1 where a = 'a') union
|
||
(select group_concat(b) as a from t1 where a = 'b');
|
||
select charset(a) from t2;
|
||
charset(a)
|
||
latin1
|
||
select charset(a) from t3;
|
||
charset(a)
|
||
latin1
|
||
latin1
|
||
drop table t1, t2, t3;
|
||
set names default;
|
||
create table t1 (c1 varchar(10), c2 int);
|
||
select charset(group_concat(c1 order by c2)) from t1;
|
||
charset(group_concat(c1 order by c2))
|
||
latin1
|
||
drop table t1;
|
||
CREATE TABLE t1 (a INT(10), b LONGTEXT, PRIMARY KEY (a));
|
||
SET GROUP_CONCAT_MAX_LEN = 20000000;
|
||
INSERT INTO t1 VALUES (1,REPEAT(CONCAT('A',CAST(CHAR(0) AS BINARY),'B'), 40000));
|
||
INSERT INTO t1 SELECT a + 1, b FROM t1;
|
||
SELECT a, CHAR_LENGTH(b) FROM t1;
|
||
a CHAR_LENGTH(b)
|
||
1 120000
|
||
2 120000
|
||
SELECT CHAR_LENGTH( GROUP_CONCAT(b) ) FROM t1;
|
||
CHAR_LENGTH( GROUP_CONCAT(b) )
|
||
240001
|
||
SET GROUP_CONCAT_MAX_LEN = 1024;
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (a int, b int);
|
||
INSERT INTO t1 VALUES (2,1), (1,2), (2,2), (1,3);
|
||
SELECT GROUP_CONCAT(a), x
|
||
FROM (SELECT a, GROUP_CONCAT(b) x FROM t1 GROUP BY a) AS s
|
||
GROUP BY x;
|
||
GROUP_CONCAT(a) x
|
||
2 1,2
|
||
1 2,3
|
||
DROP TABLE t1;
|
||
set names utf8;
|
||
create table t1
|
||
(
|
||
x text character set utf8 not null,
|
||
y integer not null
|
||
);
|
||
insert into t1 values (repeat('a', 1022), 0), (repeat(_utf8 0xc3b7, 4), 0);
|
||
set group_concat_max_len= 1022 + 10;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1032 1031 1027 aaaaaaa,÷÷÷÷ C3B7C3B7C3B7
|
||
set group_concat_max_len= 1022 + 9;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1031 1031 1027 aaaaaaa,÷÷÷÷ C3B7C3B7C3B7
|
||
set group_concat_max_len= 1022 + 8;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1030 1029 1026 aaaaaaaa,÷÷÷ C3B7C3B7C3B7
|
||
set group_concat_max_len= 1022 + 7;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1029 1029 1026 aaaaaaaa,÷÷÷ C3B7C3B7C3B7
|
||
set group_concat_max_len= 1022 + 6;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1028 1027 1025 aaaaaaaaa,÷÷ 612CC3B7C3B7
|
||
set group_concat_max_len= 1022 + 5;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1027 1027 1025 aaaaaaaaa,÷÷ 612CC3B7C3B7
|
||
set group_concat_max_len= 1022 + 4;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1026 1025 1024 aaaaaaaaaa,÷ 6161612CC3B7
|
||
set group_concat_max_len= 1022 + 3;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1025 1025 1024 aaaaaaaaaa,÷ 6161612CC3B7
|
||
set group_concat_max_len= 1022 + 2;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1024 1023 1023 aaaaaaaaaaa, 61616161612C
|
||
set group_concat_max_len= 1022 + 1;
|
||
select @x:=group_concat(x) from t1 group by y;
|
||
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
|
||
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
|
||
1023 1023 1023 aaaaaaaaaaa, 61616161612C
|
||
drop table t1;
|
||
set group_concat_max_len=1024;
|
||
set names latin1;
|
||
create table t1 (f1 int unsigned, f2 varchar(255));
|
||
insert into t1 values (1,repeat('a',255)),(2,repeat('b',255));
|
||
select f2,group_concat(f1) from t1 group by f2;
|
||
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
|
||
def test t1 t1 f2 f2 253 255 255 Y 0 0 8
|
||
def group_concat(f1) 252 1024 1 Y 128 0 63
|
||
f2 group_concat(f1)
|
||
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1
|
||
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb 2
|
||
drop table t1;
|