1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471
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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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 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
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
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(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(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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using filesort
Warnings:
Note 1003 select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c 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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using filesort
Warnings:
Note 1003 select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c 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(a)) 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 'group statement'
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 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 tinyint(4) NOT NULL default '0', PRIMARY KEY (a_id)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES (1),(2),(3);
CREATE TABLE t2 (b_id tinyint(4) NOT NULL default '0',b_a tinyint(4) NOT NULL default '0', PRIMARY KEY (b_id), KEY (b_a),
CONSTRAINT fk_b_a FOREIGN KEY (b_a) REFERENCES t1 (a_id) ON DELETE CASCADE ON UPDATE NO ACTION) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1,1),(2,1),(3,1),(4,2),(5,2);
SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t1 LEFT JOIN (t2) on t1.a_id = t2.b_a) GROUP BY t1.a_id ) AS xyz;
a_id b_list
1 1,2,3
2 4,5
3 NULL
DROP TABLE t2;
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 (id int);
SELECT GROUP_CONCAT(id) AS gc FROM t1 HAVING gc IS NULL;
gc
NULL
DROP TABLE t1;
create table r2 (a int, b int);
insert into r2 values (1,1), (2,2);
select b x, (select group_concat(x) from r2) from r2;
x (select group_concat(x) from r2)
1 1,1
2 2,2
drop table r2;
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