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c2e23208ef
In case of ROW item each compared pair does not check if argumet collations can be aggregated and thus appropiriate item conversion does not happen. The fix is to add the check and convertion for ROW pairs. mysql-test/r/row.result: test result mysql-test/t/row.test: test case sql/item.cc: added agg_item_set_converter() function which was a part of agg_item_charsets() func. The only difference is that agg_item_set_converter() checks and converts items using already known collation. sql/item.h: added agg_item_set_converter() function sql/item_cmpfunc.cc: In case of ROW item each compared pair does not check if argumet collations can be aggregated and thus appropiriate item conversion does not happen. The fix is to add the check and convertion for ROW pairs.
459 lines
15 KiB
Text
459 lines
15 KiB
Text
drop table if exists t1;
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select (1,2,3) IN ((3,2,3), (1,2,3), (1,3,3));
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(1,2,3) IN ((3,2,3), (1,2,3), (1,3,3))
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1
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select row(10,2,3) IN (row(3,2,3), row(1,2,3), row(1,3,3));
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row(10,2,3) IN (row(3,2,3), row(1,2,3), row(1,3,3))
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0
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select row(1,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3));
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row(1,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3))
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1
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select row(10,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3));
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row(10,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3))
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0
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select row('a',1.5,3) IN (row(1,2,3), row('a',1.5,3), row('a','a','a'));
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row('a',1.5,3) IN (row(1,2,3), row('a',1.5,3), row('a','a','a'))
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1
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Warnings:
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Warning 1292 Truncated incorrect DECIMAL value: 'a'
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Warning 1292 Truncated incorrect INTEGER value: 'a'
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select row('a',0,3) IN (row(3,2,3), row('a','a','3'), row(1,3,3));
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row('a',0,3) IN (row(3,2,3), row('a','a','3'), row(1,3,3))
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1
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Warnings:
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Warning 1292 Truncated incorrect INTEGER value: 'a'
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select row('a',0,3) IN (row(3,2,3), row('a','0','3'), row(1,3,3));
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row('a',0,3) IN (row(3,2,3), row('a','0','3'), row(1,3,3))
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1
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select row('a',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3));
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row('a',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3))
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1
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select row('b',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3))
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0
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select row('b',1.5,3) IN (row('b',NULL,3), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row('b',NULL,3), row('a',1.5,3), row(1,3,3))
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NULL
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select row('b',1.5,3) IN (row('b',NULL,4), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row('b',NULL,4), row('a',1.5,3), row(1,3,3))
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0
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select (1,2,(3,4)) IN ((3,2,(3,4)), (1,2,(3,4)));
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(1,2,(3,4)) IN ((3,2,(3,4)), (1,2,(3,4)))
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1
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select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,4));
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ERROR 21000: Operand should contain 2 column(s)
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select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)));
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row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)))
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NULL
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explain extended select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select ((1,2,(3,4)) in ((3,2,(3,4)),(1,2,(3,NULL)))) AS `row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)))`
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SELECT (1,2,3)=(0,NULL,3);
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(1,2,3)=(0,NULL,3)
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0
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SELECT (1,2,3)=(1,NULL,3);
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(1,2,3)=(1,NULL,3)
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NULL
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SELECT (1,2,3)=(1,NULL,0);
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(1,2,3)=(1,NULL,0)
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0
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SELECT ROW(1,2,3)=ROW(1,2,3);
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ROW(1,2,3)=ROW(1,2,3)
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1
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SELECT ROW(2,2,3)=ROW(1+1,2,3);
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ROW(2,2,3)=ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)=ROW(1+1,2,3);
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ROW(1,2,3)=ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<ROW(1+1,2,3);
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ROW(1,2,3)<ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)>ROW(1+1,2,3);
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ROW(1,2,3)>ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<=ROW(1+1,2,3);
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ROW(1,2,3)<=ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)>=ROW(1+1,2,3);
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ROW(1,2,3)>=ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<>ROW(1+1,2,3);
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ROW(1,2,3)<>ROW(1+1,2,3)
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1
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SELECT ROW(NULL,2,3)=ROW(NULL,2,3);
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ROW(NULL,2,3)=ROW(NULL,2,3)
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NULL
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SELECT ROW(NULL,2,3)<=>ROW(NULL,2,3);
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ROW(NULL,2,3)<=>ROW(NULL,2,3)
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1
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SELECT ROW(1,2,ROW(3,4,5))=ROW(1,2,ROW(3,4,5));
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ROW(1,2,ROW(3,4,5))=ROW(1,2,ROW(3,4,5))
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1
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SELECT ROW('test',2,3.33)=ROW('test',2,3.33);
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ROW('test',2,3.33)=ROW('test',2,3.33)
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1
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SELECT ROW('test',2,3.33)=ROW('test',2,3.33,4);
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ERROR 21000: Operand should contain 3 column(s)
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,33));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,33))
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1
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,3));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,3))
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0
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,NULL));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,NULL))
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NULL
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,4);
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ERROR 21000: Operand should contain 2 column(s)
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create table t1 ( a int, b int, c int);
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insert into t1 values (1,2,3), (2,3,1), (3,2,1), (1,2,NULL);
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select * from t1 where ROW(1,2,3)=ROW(a,b,c);
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a b c
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1 2 3
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select * from t1 where ROW(0,2,3)=ROW(a,b,c);
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a b c
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select * from t1 where ROW(1,2,3)<ROW(a,b,c);
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a b c
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2 3 1
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3 2 1
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select ROW(a,2,3) IN(row(1,b,c), row(2,3,1)) from t1;
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ROW(a,2,3) IN(row(1,b,c), row(2,3,1))
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1
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0
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0
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NULL
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select ROW(c,2,3) IN(row(1,b,a), row(2,3,1)) from t1;
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ROW(c,2,3) IN(row(1,b,a), row(2,3,1))
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0
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0
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1
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NULL
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select ROW(a,b,c) IN(row(1,2,3), row(3,2,1)) from t1;
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ROW(a,b,c) IN(row(1,2,3), row(3,2,1))
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1
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0
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1
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NULL
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select ROW(1,2,3) IN(row(a,b,c), row(1,2,3)) from t1;
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ROW(1,2,3) IN(row(a,b,c), row(1,2,3))
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1
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1
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1
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1
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drop table t1;
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select ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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create table t1 (i int);
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select 1 from t1 where ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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select count(*) from t1 order by ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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select count(*) from t1 having (1,1) order by i;
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ERROR 21000: Operand should contain 1 column(s)
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drop table t1;
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create table t1 (a int, b int);
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insert into t1 values (1, 4);
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insert into t1 values (10, 40);
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insert into t1 values (1, 4);
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insert into t1 values (10, 43);
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insert into t1 values (1, 4);
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insert into t1 values (10, 41);
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insert into t1 values (1, 4);
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insert into t1 values (10, 43);
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insert into t1 values (1, 4);
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select a, MAX(b), (1, MAX(b)) = (1, 4) from t1 group by a;
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a MAX(b) (1, MAX(b)) = (1, 4)
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1 4 1
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10 43 0
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drop table t1;
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SELECT ROW(2,10) <=> ROW(3,4);
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ROW(2,10) <=> ROW(3,4)
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0
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SELECT ROW(NULL,10) <=> ROW(3,NULL);
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ROW(NULL,10) <=> ROW(3,NULL)
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0
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,1));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,1),ROW(1,ROW(2,3)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,ROW(2,2,2)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3,4)) IN (ROW(1,ROW(2,3,4)),ROW(1,ROW(2,2)));
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ERROR 21000: Operand should contain 3 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),(SELECT 1,1));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),(SELECT 1,1),ROW(1,ROW(2,4)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN ((SELECT 1,1),ROW(1,ROW(2,3)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(2,1) IN (ROW(21,2),ROW(ROW(1,1,3),0));
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ERROR 21000: Operand should contain 1 column(s)
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SELECT ROW(2,1) IN (ROW(ROW(1,1,3),0),ROW(21,2));
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ERROR 21000: Operand should contain 1 column(s)
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CREATE TABLE t1(a int, b int, c int);
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INSERT INTO t1 VALUES (1, 2, 3),
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(NULL, 2, 3 ), (1, NULL, 3 ), (1, 2, NULL),
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(NULL, 2, 3+1), (1, NULL, 3+1), (1, 2+1, NULL),
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(NULL, 2, 3-1), (1, NULL, 3-1), (1, 2-1, NULL);
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SELECT (1,2,3) = (1, NULL, 3);
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(1,2,3) = (1, NULL, 3)
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NULL
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SELECT (1,2,3) = (1+1, NULL, 3);
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(1,2,3) = (1+1, NULL, 3)
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0
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SELECT (1,2,3) = (1, NULL, 3+1);
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(1,2,3) = (1, NULL, 3+1)
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0
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SELECT * FROM t1 WHERE (a,b,c) = (1,2,3);
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a b c
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1 2 3
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SELECT (1,2,3) <> (1, NULL, 3);
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(1,2,3) <> (1, NULL, 3)
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NULL
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SELECT (1,2,3) <> (1+1, NULL, 3);
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(1,2,3) <> (1+1, NULL, 3)
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1
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SELECT (1,2,3) <> (1, NULL, 3+1);
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(1,2,3) <> (1, NULL, 3+1)
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1
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SELECT * FROM t1 WHERE (a,b,c) <> (1,2,3);
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a b c
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NULL 2 4
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1 NULL 4
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1 3 NULL
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NULL 2 2
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1 NULL 2
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1 1 NULL
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SELECT (1,2,3) < (NULL, 2, 3);
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(1,2,3) < (NULL, 2, 3)
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NULL
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SELECT (1,2,3) < (1, NULL, 3);
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(1,2,3) < (1, NULL, 3)
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NULL
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SELECT (1,2,3) < (1-1, NULL, 3);
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(1,2,3) < (1-1, NULL, 3)
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0
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SELECT (1,2,3) < (1+1, NULL, 3);
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(1,2,3) < (1+1, NULL, 3)
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1
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SELECT * FROM t1 WHERE (a,b,c) < (1,2,3);
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a b c
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1 1 NULL
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SELECT (1,2,3) <= (NULL, 2, 3);
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(1,2,3) <= (NULL, 2, 3)
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NULL
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SELECT (1,2,3) <= (1, NULL, 3);
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(1,2,3) <= (1, NULL, 3)
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NULL
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SELECT (1,2,3) <= (1-1, NULL, 3);
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(1,2,3) <= (1-1, NULL, 3)
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0
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SELECT (1,2,3) <= (1+1, NULL, 3);
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(1,2,3) <= (1+1, NULL, 3)
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1
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SELECT * FROM t1 WHERE (a,b,c) <= (1,2,3);
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a b c
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1 2 3
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1 1 NULL
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SELECT (1,2,3) > (NULL, 2, 3);
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(1,2,3) > (NULL, 2, 3)
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NULL
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SELECT (1,2,3) > (1, NULL, 3);
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(1,2,3) > (1, NULL, 3)
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NULL
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SELECT (1,2,3) > (1-1, NULL, 3);
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(1,2,3) > (1-1, NULL, 3)
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1
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SELECT (1,2,3) > (1+1, NULL, 3);
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(1,2,3) > (1+1, NULL, 3)
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0
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SELECT * FROM t1 WHERE (a,b,c) > (1,2,3);
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a b c
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1 3 NULL
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SELECT (1,2,3) >= (NULL, 2, 3);
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(1,2,3) >= (NULL, 2, 3)
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NULL
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SELECT (1,2,3) >= (1, NULL, 3);
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(1,2,3) >= (1, NULL, 3)
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NULL
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SELECT (1,2,3) >= (1-1, NULL, 3);
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(1,2,3) >= (1-1, NULL, 3)
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1
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SELECT (1,2,3) >= (1+1, NULL, 3);
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(1,2,3) >= (1+1, NULL, 3)
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0
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SELECT * FROM t1 WHERE (a,b,c) >= (1,2,3);
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a b c
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1 2 3
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1 3 NULL
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DROP TABLE t1;
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SELECT ROW(1,1,1) = ROW(1,1,1) as `1`, ROW(1,1,1) = ROW(1,2,1) as `0`, ROW(1,NULL,1) = ROW(2,2,1) as `0`, ROW(1,NULL,1) = ROW(1,2,2) as `0`, ROW(1,NULL,1) = ROW(1,2,1) as `null` ;
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1 0 0 0 null
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1 0 0 0 NULL
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select row(NULL,1)=(2,0);
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row(NULL,1)=(2,0)
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0
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CREATE TABLE t1 (a int, b int, PRIMARY KEY (a,b));
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INSERT INTO t1 VALUES (1,1), (2,1), (3,1), (1,2), (3,2), (3,3);
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EXPLAIN SELECT * FROM t1 WHERE a=3 AND b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const PRIMARY PRIMARY 8 const,const 1 Using index
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EXPLAIN SELECT * FROM t1 WHERE (a,b)=(3,2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const PRIMARY PRIMARY 8 const,const 1 Using index
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SELECT * FROM t1 WHERE a=3 and b=2;
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a b
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3 2
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SELECT * FROM t1 WHERE (a,b)=(3,2);
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a b
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3 2
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CREATE TABLE t2 (a int, b int, c int, PRIMARY KEY (a,b,c));
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INSERT INTO t2 VALUES
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(1,1,2), (3,1,3), (1,2,2), (4,4,2),
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(1,1,1), (3,1,1), (1,2,1);
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EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=t2.b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a,test.t1.b 1 Using index
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EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a,test.t1.b 1 Using index
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SELECT * FROM t1,t2 WHERE t1.a=t2.a and t1.b=t2.b;
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a b a b c
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1 1 1 1 1
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1 1 1 1 2
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1 2 1 2 1
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1 2 1 2 2
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3 1 3 1 1
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3 1 3 1 3
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SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b);
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a b a b c
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1 1 1 1 1
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1 1 1 1 2
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1 2 1 2 1
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1 2 1 2 2
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3 1 3 1 1
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3 1 3 1 3
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EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
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EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
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SELECT * FROM t1,t2 WHERE t1.a=1 and t1.b=t2.b;
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a b a b c
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1 1 1 1 2
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1 1 3 1 3
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|
1 2 1 2 2
|
|
1 1 1 1 1
|
|
1 1 3 1 1
|
|
1 2 1 2 1
|
|
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
|
|
a b a b c
|
|
1 2 1 1 1
|
|
1 2 1 1 2
|
|
1 2 1 2 1
|
|
1 2 1 2 2
|
|
3 2 3 1 1
|
|
3 2 3 1 3
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using index
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
|
|
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
|
|
a b a b c
|
|
1 2 1 1 1
|
|
1 2 1 1 2
|
|
3 2 3 1 1
|
|
3 2 3 1 3
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 index NULL PRIMARY 12 NULL 7 Using where; Using index
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (((`test`.`t1`.`a` - 1) = (`test`.`t2`.`a` - 1)) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
|
|
SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
|
|
a b a b c
|
|
1 2 1 1 2
|
|
3 2 3 1 3
|
|
1 2 1 1 1
|
|
3 2 3 1 1
|
|
EXPLAIN SELECT * FROM t2 WHERE a=3 AND b=2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
|
|
EXPLAIN SELECT * FROM t2 WHERE (a,b)=(3,2);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
|
|
SELECT * FROM t2 WHERE a=3 and b=2;
|
|
a b c
|
|
SELECT * FROM t2 WHERE (a,b)=(3,2);
|
|
a b c
|
|
EXPLAIN SELECT * FROM t1,t2 WHERE t2.a=t1.a AND t2.b=2 AND t2.c=1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
|
|
SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
|
|
a b a b c
|
|
1 1 1 2 1
|
|
1 2 1 2 1
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
|
|
SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
|
|
a b a b c
|
|
1 1 1 2 1
|
|
1 2 1 2 1
|
|
DROP TABLE t1,t2;
|
|
CREATE TABLE t1(
|
|
a int, b int, c int, d int, e int, f int, g int, h int,
|
|
PRIMARY KEY (a,b,c,d,e,f,g)
|
|
);
|
|
INSERT INTO t1 VALUES (1,2,3,4,5,6,7,99);
|
|
SELECT h FROM t1 WHERE (a,b,c,d,e,f,g)=(1,2,3,4,5,6,7);
|
|
h
|
|
99
|
|
SET @x:= (SELECT h FROM t1 WHERE (a,b,c,d,e,f,g)=(1,2,3,4,5,6,7));
|
|
SELECT @x;
|
|
@x
|
|
99
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (a INT, b INT);
|
|
INSERT INTO t1 VALUES (1,1);
|
|
SELECT ROW(a, 1) IN (SELECT SUM(b), 1) FROM t1 GROUP BY a;
|
|
ROW(a, 1) IN (SELECT SUM(b), 1)
|
|
1
|
|
SELECT ROW(a, 1) IN (SELECT SUM(b), 3) FROM t1 GROUP BY a;
|
|
ROW(a, 1) IN (SELECT SUM(b), 3)
|
|
0
|
|
DROP TABLE t1;
|
|
create table t1 (a varchar(200),
|
|
b int unsigned not null primary key auto_increment)
|
|
default character set 'utf8';
|
|
create table t2 (c varchar(200),
|
|
d int unsigned not null primary key auto_increment)
|
|
default character set 'latin1';
|
|
insert into t1 (a) values('abc');
|
|
insert into t2 (c) values('abc');
|
|
select * from t1,t2 where (a,b) = (c,d);
|
|
a b c d
|
|
abc 1 abc 1
|
|
select host,user from mysql.user where (host,user) = ('localhost','test');
|
|
host user
|
|
drop table t1,t2;
|