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31ba88c0c1
Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x Small change in EXCHANGE output Propagate open-files-limit from mysqld_safe -> mysqld Fixed speed bug in GROUP BY Added quotes around database name in CREATE DATABASE db_name (for binary log) BitKeeper/etc/ignore: added stamp-h1 Docs/manual.texi: Added 4.1 manual section Updated changelog client/mysqltest.c: Added --skip-safemalloc include/my_global.h: Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x mysql-test/mysql-test-run.sh: Start mysqltest with --skip-safemalloc (To get it faster) mysql-test/r/bdb.result: Update for new EXPLAIN output mysql-test/r/compare.result: Update for new EXPLAIN output mysql-test/r/create.result: Update for new EXPLAIN output mysql-test/r/distinct.result: Update for new EXPLAIN output mysql-test/r/explain.result: Update for new EXPLAIN output mysql-test/r/group_by.result: Update for new EXPLAIN output mysql-test/r/heap.result: Update for new EXPLAIN output mysql-test/r/innodb.result: Update for new EXPLAIN output mysql-test/r/join_outer.result: Update for new EXPLAIN output mysql-test/r/key_diff.result: Update for new EXPLAIN output mysql-test/r/merge.result: Update for new EXPLAIN output mysql-test/r/null_key.result: Update for new EXPLAIN output mysql-test/r/order_by.result: Update for new EXPLAIN output mysql-test/r/select.result: Update for new EXPLAIN output mysql-test/r/temp_table.result: Fixed speed bug in GROUP BY mysql-test/r/type_datetime.result: Update for new EXPLAIN output mysql-test/r/user_var.result: Update for new EXPLAIN output mysql-test/r/variables.result: Removed variable safe_show_database mysql-test/t/temp_table.test: Fixed speed bug in GROUP BY mysql-test/t/variables.test: Removed not used variable safe_show_databases scripts/mysqld_safe.sh: Propagate open-files-limit from mysqld_safe -> mysqld sql/mysqld.cc: Removed variable safe_show_database sql/set_var.cc: Removed variable safe_show_database sql/slave.cc: Updated error message sql/sql_db.cc: Added quotes around database name in CREATE DATABASE db_name sql/sql_select.cc: Fixed speed bug in GROUP BY
32 lines
1.3 KiB
Text
32 lines
1.3 KiB
Text
set @a := foo;
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Unknown column 'foo' in 'field list'
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set @a := connection_id() + 3;
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select @a - connection_id();
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@a - connection_id()
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3
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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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i
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1
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2
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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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i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
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1 1 0 1 2
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2 1 0 0 1
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explain select * from t1 where i=@vv1;
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table type possible_keys key key_len ref rows Extra
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t1 ref i i 4 const 1 Using where
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 3 Using where
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explain select @vv1:=i from t1 where i=@vv1;
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table type possible_keys key key_len ref rows Extra
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t1 index NULL i 4 NULL 3 Using where; Using index
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explain select * from t1 where i=@vv1;
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table type possible_keys key key_len ref rows Extra
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t1 ref i i 4 const 1 Using where
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drop table t1,t2;
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