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fc45b816f7
Item_func_group_concat::fix_fields() set maybe_null flag to 0, and set it to 1 only if some of it's arguments may be null. When used in subquery in tmp table created field which can't be null. When no data retireved result field have to be set to null and error mentioned in bug report occurs. Also this bug can occur if selecting from not null field in empty table. Function group_concat now marked maybe_null from the very beginning not only if some of it's argument may be null. sql/item_sum.cc: Fix bug #12861 client hang with group_concat insubquery FROM DUAL. mysql-test/r/func_gconcat.result: Test case for bug #12861 client hang with group_concat insubquery FROM DUAL. mysql-test/t/func_gconcat.test: Test case for bug #12861 client hang with group_concat insubquery FROM DUAL.
554 lines
27 KiB
Plaintext
554 lines
27 KiB
Plaintext
drop table if exists t1, t2;
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create table t1 (grp int, a bigint unsigned, c char(10) not null, d char(10) not null);
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insert into t1 values (1,1,"a","a");
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insert into t1 values (2,2,"b","a");
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insert into t1 values (2,3,"c","b");
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insert into t1 values (3,4,"E","a");
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insert into t1 values (3,5,"C","b");
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insert into t1 values (3,6,"D","b");
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insert into t1 values (3,7,"d","d");
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insert into t1 values (3,8,"d","d");
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insert into t1 values (3,9,"D","c");
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select grp,group_concat(c) from t1 group by grp;
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grp group_concat(c)
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1 a
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2 b,c
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3 E,C,D,d,d,D
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explain extended select grp,group_concat(c) from t1 group by grp;
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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 9 Using filesort
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Warnings:
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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
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select grp,group_concat(a,c) from t1 group by grp;
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grp group_concat(a,c)
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1 1a
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2 2b,3c
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3 4E,5C,6D,7d,8d,9D
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select grp,group_concat("(",a,":",c,")") from t1 group by grp;
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grp group_concat("(",a,":",c,")")
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1 (1:a)
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2 (2:b),(3:c)
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3 (4:E),(5:C),(6:D),(7:d),(8:d),(9:D)
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select grp,group_concat(c separator ",") from t1 group by grp;
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grp group_concat(c separator ",")
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1 a
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2 b,c
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3 E,C,D,d,d,D
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select grp,group_concat(c separator "---->") from t1 group by grp;
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grp group_concat(c separator "---->")
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1 a
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2 b---->c
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3 E---->C---->D---->d---->d---->D
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select grp,group_concat(c order by c) from t1 group by grp;
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grp group_concat(c order by c)
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1 a
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2 b,c
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3 C,D,d,d,D,E
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select grp,group_concat(c order by c desc) from t1 group by grp;
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grp group_concat(c order by c desc)
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1 a
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2 c,b
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3 E,D,d,d,D,C
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select grp,group_concat(d order by a) from t1 group by grp;
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grp group_concat(d order by a)
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1 a
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2 a,b
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3 a,b,b,d,d,c
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select grp,group_concat(d order by a desc) from t1 group by grp;
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grp group_concat(d order by a desc)
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1 a
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2 b,a
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3 c,d,d,b,b,a
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select grp,group_concat(a order by a,d+c-ascii(c)-a) from t1 group by grp;
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grp group_concat(a order by a,d+c-ascii(c)-a)
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1 1
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2 2,3
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3 4,5,6,7,8,9
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select grp,group_concat(a order by d+c-ascii(c),a) from t1 group by grp;
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grp group_concat(a order by d+c-ascii(c),a)
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1 1
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2 3,2
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3 7,8,4,6,9,5
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select grp,group_concat(c order by 1) from t1 group by grp;
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grp group_concat(c order by 1)
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1 a
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2 b,c
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3 C,D,d,d,D,E
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select grp,group_concat(c order by "c") from t1 group by grp;
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grp group_concat(c order by "c")
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1 a
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2 b,c
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3 C,D,d,d,D,E
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select grp,group_concat(distinct c order by c) from t1 group by grp;
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grp group_concat(distinct c order by c)
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1 a
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2 b,c
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3 C,D,E
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select grp,group_concat(distinct c order by c desc) from t1 group by grp;
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grp group_concat(distinct c order by c desc)
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1 a
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2 c,b
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3 E,D,C
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explain extended select grp,group_concat(distinct c order by c desc) from t1 group by grp;
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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 9 Using filesort
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Warnings:
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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
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select grp,group_concat(c order by c separator ",") from t1 group by grp;
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grp group_concat(c order by c separator ",")
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1 a
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2 b,c
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3 C,D,d,d,D,E
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select grp,group_concat(c order by c desc separator ",") from t1 group by grp;
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grp group_concat(c order by c desc separator ",")
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1 a
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2 c,b
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3 E,D,d,d,D,C
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select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
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grp group_concat(distinct c order by c separator ",")
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1 a
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2 b,c
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3 C,D,E
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explain extended select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
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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 9 Using filesort
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Warnings:
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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
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select grp,group_concat(distinct c order by c desc separator ",") from t1 group by grp;
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grp group_concat(distinct c order by c desc separator ",")
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1 a
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2 c,b
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3 E,D,C
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select grp,group_concat(c order by grp desc) from t1 group by grp order by grp;
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grp group_concat(c order by grp desc)
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1 a
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2 c,b
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3 D,d,d,D,C,E
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select grp, group_concat(a separator "")+0 from t1 group by grp;
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grp group_concat(a separator "")+0
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1 1
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2 23
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3 456789
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select grp, group_concat(a separator "")+0.0 from t1 group by grp;
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grp group_concat(a separator "")+0.0
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1 1.0
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2 23.0
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3 456789.0
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select grp, ROUND(group_concat(a separator "")) from t1 group by grp;
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grp ROUND(group_concat(a separator ""))
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1 1
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2 23
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3 456789
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drop table t1;
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create table t1 (grp int, c char(10));
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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);
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select grp,group_concat(c order by c) from t1 group by grp;
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grp group_concat(c order by c)
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1 NULL
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2 b
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3 D,D,E
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4
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5 NULL
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set group_concat_max_len = 4;
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select grp,group_concat(c) from t1 group by grp;
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grp group_concat(c)
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1 NULL
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2 b
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3 D,D,
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4
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5 NULL
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Warnings:
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Warning 1260 1 line(s) were cut by GROUP_CONCAT()
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show warnings;
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Level Code Message
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Warning 1260 1 line(s) were cut by GROUP_CONCAT()
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set group_concat_max_len = 1024;
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select group_concat(sum(a)) from t1 group by grp;
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ERROR HY000: Invalid use of group function
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select grp,group_concat(c order by 2) from t1 group by grp;
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ERROR 42S22: Unknown column '2' in 'group statement'
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drop table t1;
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create table t1 ( URL_ID int(11), URL varchar(80));
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create table t2 ( REQ_ID int(11), URL_ID int(11));
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insert into t1 values (4,'www.host.com'), (5,'www.google.com'),(5,'www.help.com');
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insert into t2 values (1,4), (5,4), (5,5);
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select REQ_ID, Group_Concat(URL) as URL from t1, t2 where
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t2.URL_ID = t1.URL_ID group by REQ_ID;
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REQ_ID URL
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1 X
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5 X,X,X
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select REQ_ID, Group_Concat(URL) as URL, Min(t1.URL_ID) urll,
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Max(t1.URL_ID) urlg from t1, t2 where t2.URL_ID = t1.URL_ID group by REQ_ID;
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REQ_ID URL urll urlg
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1 X 4 4
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5 X,X,X 4 5
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drop table t1;
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drop table t2;
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create table t1 (id int, name varchar(16));
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insert into t1 values (1,'longername'),(1,'evenlongername');
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select ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'without distinct: how it should be' from t1;
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without distinct: how it should be
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1:longername,1:evenlongername
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select distinct ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'with distinct: cutoff at length of shortname' from t1;
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with distinct: cutoff at length of shortname
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1:longername,1:evenlongername
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drop table t1;
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create table t1(id int);
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create table t2(id int);
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insert into t1 values(0),(1);
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select group_concat(t1.id) FROM t1,t2;
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group_concat(t1.id)
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NULL
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drop table t1;
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drop table t2;
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create table t1 (bar varchar(32));
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insert into t1 values('test1'),('test2');
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select group_concat(bar order by concat(bar,bar)) from t1;
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group_concat(bar order by concat(bar,bar))
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test1,test2
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select group_concat(bar order by concat(bar,bar) desc) from t1;
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group_concat(bar order by concat(bar,bar) desc)
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test2,test1
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select bar from t1 having group_concat(bar)='';
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bar
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select bar from t1 having instr(group_concat(bar), "test") > 0;
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bar
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test1
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select bar from t1 having instr(group_concat(bar order by concat(bar,bar) desc), "test2,test1") > 0;
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bar
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test1
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drop table t1;
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create table t1 (a int, a1 varchar(10));
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create table t2 (a0 int);
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insert into t1 values (0,"a"),(0,"b"),(1,"c");
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insert into t2 values (1),(2),(3);
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select group_concat(a1 order by (t1.a IN (select a0 from t2))) from t1;
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group_concat(a1 order by (t1.a IN (select a0 from t2)))
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b,a,c
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select group_concat(a1 order by (t1.a)) from t1;
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group_concat(a1 order by (t1.a))
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b,a,c
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drop table t1, t2;
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CREATE TABLE t1 (id1 tinyint(4) NOT NULL, id2 tinyint(4) NOT NULL);
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INSERT INTO t1 VALUES (1, 1),(1, 2),(1, 3),(1, 4),(1, 5),(2, 1),(2, 2),(2, 3);
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CREATE TABLE t2 (id1 tinyint(4) NOT NULL);
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INSERT INTO t2 VALUES (1),(2),(3),(4),(5);
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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;
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id1 concat_id
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1 1,2,3,4,5
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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;
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id1 concat_id
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1 1,2,3,4,5
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2 1,2,3
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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;
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id1 concat_id
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1 5,4,3,2,1
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2 3,2,1
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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;
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id1 concat_id
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1 5,4,3,2,1
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2 3,2,1
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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;
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id1 concat_id
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1 51,42,33,24,15
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2 33,24,15
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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;
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id1 concat_id
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1 51,42,33,24,15
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2 33,24,15
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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;
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id1 concat_id
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1 5/1,4/2,3/3,2/4,1/5
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2 3/3,2/4,1/5
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drop table t1,t2;
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create table t1 (s1 char(10), s2 int not null);
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insert into t1 values ('a',2),('b',2),('c',1),('a',3),('b',4),('c',4);
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select distinct s1 from t1 order by s2,s1;
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s1
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c
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a
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b
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select group_concat(distinct s1) from t1;
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group_concat(distinct s1)
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a,b,c
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select group_concat(distinct s1 order by s2) from t1 where s2 < 4;
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group_concat(distinct s1 order by s2)
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c,b,a
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select group_concat(distinct s1 order by s2) from t1;
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group_concat(distinct s1 order by s2)
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c,b,a,c
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drop table t1;
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create table t1 (a int, c int);
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insert into t1 values (1, 2), (2, 3), (2, 4), (3, 5);
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create table t2 (a int, c int);
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insert into t2 values (1, 5), (2, 4), (3, 3), (3,3);
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select group_concat(c) from t1;
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group_concat(c)
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2,3,4,5
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select group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1;
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grp
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5,4,3,2
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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;
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grp
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5,4,3,2
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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;
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grp
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2,4,3,5
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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;
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a grp
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1 2
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2 4,3
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3 5
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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;
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a grp
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1 2
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2 4,3
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3 5
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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;
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a grp
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1 2
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2 4,3
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3 5
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select a,c,(select group_concat(c order by a) from t2 where a=t1.a) as grp from t1 order by grp;
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a c grp
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3 5 3,3
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2 3 4
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2 4 4
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1 2 5
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drop table t1,t2;
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CREATE TABLE t1 ( a int );
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CREATE TABLE t2 ( a int );
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INSERT INTO t1 VALUES (1), (2);
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INSERT INTO t2 VALUES (1), (2);
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SELECT GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a) FROM t1, t2 GROUP BY t1.a;
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GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a)
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1,2
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2,4
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DROP TABLE t1, t2;
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CREATE TABLE t1 (a char(4));
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INSERT INTO t1 VALUES ('John'), ('Anna'), ('Bill');
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SELECT GROUP_CONCAT(a SEPARATOR '||') AS names FROM t1
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HAVING names LIKE '%An%';
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names
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John||Anna||Bill
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SELECT GROUP_CONCAT(a SEPARATOR '###') AS names FROM t1
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HAVING LEFT(names, 1) ='J';
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names
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John###Anna###Bill
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DROP TABLE t1;
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CREATE TABLE t1 ( a int, b TEXT );
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INSERT INTO t1 VALUES (1,'First Row'), (2,'Second Row');
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SELECT GROUP_CONCAT(b ORDER BY b) FROM t1 GROUP BY a;
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GROUP_CONCAT(b ORDER BY b)
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First Row
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Second Row
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DROP TABLE t1;
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CREATE TABLE t1 (A_ID INT NOT NULL,A_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID));
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INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ');
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CREATE TABLE t2 (A_ID INT NOT NULL,B_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID,B_DESC));
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INSERT INTO t2 VALUES (1,'A'),(1,'B'),(3,'F');
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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;
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A_ID B_DESC
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1 A,B
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2 NULL
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3 F
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DROP TABLE t1;
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DROP TABLE t2;
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create table t1 (a int, b text);
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insert into t1 values (1, 'bb'), (1, 'ccc'), (1, 'a'), (1, 'bb'), (1, 'ccc');
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insert into t1 values (2, 'BB'), (2, 'CCC'), (2, 'A'), (2, 'BB'), (2, 'CCC');
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select group_concat(b) from t1 group by a;
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group_concat(b)
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bb,ccc,a,bb,ccc
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BB,CCC,A,BB,CCC
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select group_concat(distinct b) from t1 group by a;
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group_concat(distinct b)
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bb,ccc,a
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BB,CCC,A
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select group_concat(b order by b) from t1 group by a;
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group_concat(b order by b)
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a,bb,bb,ccc,ccc
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A,BB,BB,CCC,CCC
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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` longtext character set cp1250
|
|
) 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 (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 (
|
|
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')
|
|
NULL
|