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c669254da7
Docs/manual.texi: Updated info about some common problems. mysql-test/r/user_var.result: Added tests of using user variables. mysql-test/t/user_var.test: Added tests of using user variables.
20 lines
825 B
Plaintext
20 lines
825 B
Plaintext
error 1204;
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set @a := foo;
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set @a := connection_id() + 3;
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select @a - connection_id();
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# Check using and setting variables with SELECT DISTINCT
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drop table if exists t1,t2;
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CREATE TABLE t1 ( i int not null, v int not null,index (i));
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insert into t1 values (1,1),(1,3),(2,1);
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create table t2 (i int not null, unique (i));
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insert into t2 select distinct i from t1;
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select * from t2;
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select distinct t2.i,@vv1:=if(sv1.i,1,0),@vv2:=if(sv2.i,1,0),@vv3:=if(sv3.i,1,0), @vv1+@vv2+@vv3 from t2 left join t1 as sv1 on sv1.i=t2.i and sv1.v=1 left join t1 as sv2 on sv2.i=t2.i and sv2.v=2 left join t1 as sv3 on sv3.i=t2.i and sv3.v=3;
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explain select * from t1 where i=@vv1;
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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explain select @vv1:=i from t1 where i=@vv1;
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explain select * from t1 where i=@vv1;
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drop table t1,t2;
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