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9cba6c5aa3
This allows one to run the test suite even if any of the following options are changed: - character-set-server - collation-server - join-cache-level - log-basename - max-allowed-packet - optimizer-switch - query-cache-size and query-cache-type - skip-name-resolve - table-definition-cache - table-open-cache - Some innodb options etc Changes: - Don't print out the value of system variables as one can't depend on them to being constants. - Don't set global variables to 'default' as the default may not be the same as the test was started with if there was an additional option file. Instead save original value and reset it at end of test. - Test that depends on the latin1 character set should include default_charset.inc or set the character set to latin1 - Test that depends on the original optimizer switch, should include default_optimizer_switch.inc - Test that depends on the value of a specific system variable should set it in the test (like optimizer_use_condition_selectivity) - Split subselect3.test into subselect3.test and subselect3.inc to make it easier to set and reset system variables. - Added .opt files for test that required specfic options that could be changed by external configuration files. - Fixed result files in rockdsb & tokudb that had not been updated for a while.
579 lines
17 KiB
Text
579 lines
17 KiB
Text
#
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# Tests for LIMIT ROWS EXAMINED, MDEV-28
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#
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--source include/default_optimizer_switch.inc
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call mtr.add_suppression("Sort aborted.*");
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set @save_join_cache_level = @@join_cache_level;
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create table t1 (c1 char(2));
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create table t2 (c2 char(2));
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insert into t1 values ('bb'), ('cc'), ('aa'), ('dd');
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insert into t2 values ('bb'), ('cc'), ('dd'), ('ff');
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create table t1i (c1 char(2) key);
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create table t2i (c2 char(2) key);
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insert into t1i values ('bb'), ('cc'), ('aa'), ('dd');
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insert into t2i values ('bb'), ('cc'), ('dd'), ('ff');
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--echo =========================================================================
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--echo Simple joins
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--echo =========================================================================
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--echo Simple nested loops join without blocking
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set @@join_cache_level=0;
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explain
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2;
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2;
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explain
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 4;
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 4;
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--echo Blocked nested loops join, empty result set because of blocking
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set @@join_cache_level=1;
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explain
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 6;
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 6;
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explain
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
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set @@join_cache_level=6;
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explain
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 3;
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 3;
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explain
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
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select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
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--echo Mix LIMIT ROWS EXAMINED with LIMIT
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set @@join_cache_level=0;
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explain
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select * from t1, t2 where c1 < c2 LIMIT 1 ROWS EXAMINED 4;
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select * from t1, t2 where c1 < c2 LIMIT 1 ROWS EXAMINED 4;
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explain
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select * from t1, t2 where c1 < c2 LIMIT 1,1 ROWS EXAMINED 4;
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select * from t1, t2 where c1 < c2 LIMIT 1,1 ROWS EXAMINED 4;
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--echo Empty table optimized away during constant optimization
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create table t0 (c0 int);
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explain
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select * from t0 LIMIT ROWS EXAMINED 0;
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explain
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select * from t0 LIMIT ROWS EXAMINED 1;
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select * from t0 LIMIT ROWS EXAMINED 1;
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drop table t0;
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create table t0 (c0 char(2) primary key);
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insert into t0 values ('bb'), ('cc'), ('aa');
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explain
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select * from t0 where c0 = 'bb' LIMIT ROWS EXAMINED 0;
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select * from t0 where c0 = 'bb' LIMIT ROWS EXAMINED 0;
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explain
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select * from t0, t1 where c0 = 'bb' and c1 > c0 LIMIT ROWS EXAMINED 0;
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select * from t0, t1 where c0 = 'bb' and c1 > c0 LIMIT ROWS EXAMINED 0;
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set @@join_cache_level = @save_join_cache_level;
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drop table t0;
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--echo =========================================================================
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--echo LIMIT ROWS EXAMINED with parameter argument
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--echo =========================================================================
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set @@join_cache_level=0;
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set @l = 2;
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--echo Prepared statement parameter
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prepare st1 from "select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED ?";
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execute st1 using @l;
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deallocate prepare st1;
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--echo User variable (not supported for LIMIT in MariaDB 5.3/MySQL 5.1)
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--error 1064
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED @l;
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--echo Stored procedure parameter
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delimiter |;
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create procedure test_limit_rows(l int)
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begin
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED l;
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end|
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delimiter ;|
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call test_limit_rows(3);
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drop procedure test_limit_rows;
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set @@join_cache_level = @save_join_cache_level;
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--echo =========================================================================
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--echo UNIONs (with several LIMIT ROWS EXAMINED clauses)
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--echo =========================================================================
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(select * from t1, t2 where c1 = c2)
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UNION
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(select * from t1, t2 where c1 < c2) LIMIT ROWS EXAMINED 6;
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(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0)
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UNION
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(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 6);
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--error ER_PARSE_ERROR
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select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0
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UNION
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select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 6;
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(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0)
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UNION
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(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 6;
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(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0)
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UNION
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(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0)
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LIMIT 1 ROWS EXAMINED 6;
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(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0)
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UNION
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(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0)
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LIMIT 2 ROWS EXAMINED 10;
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--echo =========================================================================
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--echo Subqueries (with several LIMIT ROWS EXAMINED clauses)
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--echo =========================================================================
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--echo Subqueries, semi-join
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 11);
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 11);
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ')
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LIMIT ROWS EXAMINED 11;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ')
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LIMIT ROWS EXAMINED 11;
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 11;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 11;
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explain
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ')
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LIMIT ROWS EXAMINED 6;
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ')
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LIMIT ROWS EXAMINED 6;
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--echo Subqueries with IN-TO-EXISTS
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set @@optimizer_switch='semijoin=off,in_to_exists=on,materialization=off';
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 4);
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 4);
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ')
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LIMIT ROWS EXAMINED 4;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ')
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LIMIT ROWS EXAMINED 4;
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 4;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 4;
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explain
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ')
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LIMIT ROWS EXAMINED 9;
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ')
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LIMIT ROWS EXAMINED 9;
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--echo Same as above, without subquery cache
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set @@optimizer_switch='subquery_cache=off';
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 2);
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ')
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LIMIT ROWS EXAMINED 2;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 2;
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ')
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LIMIT ROWS EXAMINED 5;
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--echo Subqueries with materialization
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set @@optimizer_switch='semijoin=off,in_to_exists=off,materialization=on,subquery_cache=on';
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13);
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13);
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ') LIMIT ROWS EXAMINED 13;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ') LIMIT ROWS EXAMINED 13;
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explain
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 13;
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select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)
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LIMIT ROWS EXAMINED 13;
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explain
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ') LIMIT ROWS EXAMINED 17;
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select * from t1i
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where c1 IN (select * from t2i where c2 > ' ') LIMIT ROWS EXAMINED 17;
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set @@optimizer_switch='default';
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--echo =========================================================================
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--echo Views and derived tables
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--echo =========================================================================
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--error 1235
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create view v1 as
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select * from t1 where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13);
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create view v1 as
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select * from t1 where c1 IN (select * from t2 where c2 > ' ');
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select * from v1;
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select * from v1 LIMIT ROWS EXAMINED 17;
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select * from v1 LIMIT ROWS EXAMINED 16;
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select * from v1 LIMIT ROWS EXAMINED 11;
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drop view v1;
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explain
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select *
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from (select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)) as tmp
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LIMIT ROWS EXAMINED 11;
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select *
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from (select * from t1
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where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)) as tmp
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LIMIT ROWS EXAMINED 11;
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--echo =========================================================================
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--echo Aggregation
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--echo =========================================================================
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create table t3 (c1 char(2), c2 int);
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insert into t3 values
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('aa', 1), ('aa', 2),
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('bb', 3), ('bb', 4), ('bb', 5);
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explain
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select c1, sum(c2) from t3 group by c1;
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select c1, sum(c2) from t3 group by c1;
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explain
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select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 0;
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select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 0;
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select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 1;
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select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 20;
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select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 21;
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create table t3i (c1 char(2), c2 int);
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create index it3i on t3i(c1);
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create index it3j on t3i(c2,c1);
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insert into t3i values
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('aa', 1), ('aa', 2),
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('bb', 3), ('bb', 4), ('bb', 5);
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explain
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select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 0;
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select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 0;
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select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 1;
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select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 20;
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select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 21;
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--echo Aggregation without grouping
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explain
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select min(c2) from t3 LIMIT ROWS EXAMINED 5;
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select min(c2) from t3 LIMIT ROWS EXAMINED 5;
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select max(c2) from t3 LIMIT ROWS EXAMINED 6;
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select max(c2) from t3 LIMIT ROWS EXAMINED 0;
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explain
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select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5;
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select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5;
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select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 6;
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select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 0;
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explain
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select count(c2) from t3 LIMIT ROWS EXAMINED 5;
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select count(c2) from t3 LIMIT ROWS EXAMINED 5;
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select count(c2) from t3 LIMIT ROWS EXAMINED 6;
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select count(c2) from t3 LIMIT ROWS EXAMINED 0;
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explain
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select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5;
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select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5;
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select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 6;
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explain
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select sum(c2) from t3 LIMIT ROWS EXAMINED 5;
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select sum(c2) from t3 LIMIT ROWS EXAMINED 5;
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select sum(c2) from t3 LIMIT ROWS EXAMINED 6;
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--echo The query result is found during optimization, LIMIT ROWS EXAMINED has no effect.
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explain
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select max(c1) from t3i LIMIT ROWS EXAMINED 0;
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select max(c1) from t3i LIMIT ROWS EXAMINED 0;
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create table t3_empty like t3;
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explain
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select max(c1) from t3_empty LIMIT ROWS EXAMINED 0;
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select max(c1) from t3_empty LIMIT ROWS EXAMINED 0;
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drop table t3_empty;
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--echo =========================================================================
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--echo Sorting
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--echo =========================================================================
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explain
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select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2;
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--error 1028
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select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2;
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explain
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select c1, c2 from t3i order by c2, c1 LIMIT ROWS EXAMINED 2;
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select c1, c2 from t3i order by c2, c1 LIMIT ROWS EXAMINED 2;
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explain
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select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2;
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--error 1028
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select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2;
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drop table t3,t3i;
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--echo =========================================================================
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--echo INSERT/DELETE/UPDATE
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--echo =========================================================================
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--echo INSERT ... SELECT
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CREATE TABLE t4 (a int);
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INSERT INTO t4 values (1), (2);
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INSERT IGNORE INTO t4 SELECT a + 2 FROM t4 LIMIT ROWS EXAMINED 0;
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select * from t4;
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INSERT INTO t4 SELECT a + 2 FROM t4 LIMIT ROWS EXAMINED 6;
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select * from t4;
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drop table t4;
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--echo DELETE - LIMIT ROWS EXAMINED not supported
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CREATE TABLE t4 (a int);
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INSERT INTO t4 values (1), (2);
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--error 1064
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DELETE FROM t4 WHERE t4.a > 0 LIMIT ROWS EXAMINED 0;
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--error 1064
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DELETE FROM t4 WHERE t4.a > 0 LIMIT 0 ROWS EXAMINED 0;
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drop table t4;
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--echo UPDATE - LIMIT ROWS EXAMINED not supported
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CREATE TABLE t4 (a int);
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INSERT INTO t4 values (1), (2);
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--error 1064
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update t4 set a=a+10 LIMIT ROWS EXAMINED 0;
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--error 1064
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update t4 set a=a+10 LIMIT 0 ROWS EXAMINED 0;
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drop table t4;
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drop table t1,t2,t1i,t2i;
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--echo =========================================================================
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--echo Test cases for bugs
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--echo =========================================================================
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--echo
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--echo MDEV-115
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--echo
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SET @@optimizer_switch='in_to_exists=on,outer_join_with_cache=on';
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CREATE TABLE t1 ( a VARCHAR(3) ) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('USA'),('CAN');
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CREATE TABLE t2 ( b INT );
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INSERT INTO t2 VALUES (3899),(3914),(3888);
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CREATE TABLE t3 ( c VARCHAR(33), d INT );
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INSERT INTO t3 VALUES ('USASpanish',8),('USATagalog',0),('USAVietnamese',0);
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|
|
|
EXPLAIN
|
|
SELECT DISTINCT a AS field1 FROM t1, t2
|
|
WHERE EXISTS (SELECT c FROM t3 LEFT JOIN t2 ON b = d)
|
|
HAVING field1 > 'aaa' LIMIT ROWS EXAMINED 20;
|
|
|
|
SELECT DISTINCT a AS field1 FROM t1, t2
|
|
WHERE EXISTS (SELECT c FROM t3 LEFT JOIN t2 ON b = d)
|
|
HAVING field1 > 'aaa' LIMIT ROWS EXAMINED 20;
|
|
|
|
EXPLAIN
|
|
SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 14;
|
|
SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 14;
|
|
|
|
SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 15;
|
|
SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 16;
|
|
|
|
drop table t1,t2,t3;
|
|
|
|
set @@optimizer_switch='default';
|
|
|
|
--echo
|
|
--echo MDEV-153
|
|
--echo
|
|
|
|
CREATE TABLE t1 ( a TIME, b DATETIME, KEY(a), KEY(b) ) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES
|
|
('21:22:34.025509', '2002-02-13 17:30:06.013935'),
|
|
('10:50:38.059966', '2008-09-27 00:34:58.026613'),
|
|
('00:21:38.058143', '2007-05-28 00:00:00');
|
|
|
|
CREATE TABLE t2 ( c INT, d TIME, e DATETIME, f VARCHAR(1), KEY(c) ) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES
|
|
(0, '11:03:22.062907', '2007-06-02 11:16:01.053212', 'a'),
|
|
(0, '08:14:05.001407', '1900-01-01 00:00:00', 'm'),
|
|
(5, '19:03:16.024974', '1900-01-01 00:00:00', 'f'),
|
|
(1, '07:23:34.034234', '2000-11-26 05:01:11.054228', 'z'),
|
|
(6, '12:29:32.019411', '2006-02-13 00:00:00', 'f'),
|
|
(6, '06:07:10.010496', '2007-06-08 04:35:26.020373', 'a'),
|
|
(7, '22:55:09.020772', '2005-04-27 00:00:00', 'i');
|
|
|
|
EXPLAIN
|
|
SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5
|
|
FROM t1, t2 AS alias2, t2 AS alias3
|
|
WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 )
|
|
GROUP BY field1, field2, field3, field4, field5
|
|
LIMIT ROWS EXAMINED 120;
|
|
|
|
FLUSH STATUS;
|
|
SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5
|
|
FROM t1, t2 AS alias2, t2 AS alias3
|
|
WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 )
|
|
GROUP BY field1, field2, field3, field4, field5
|
|
LIMIT ROWS EXAMINED 120;
|
|
SHOW STATUS LIKE 'Handler_read%';
|
|
SHOW STATUS LIKE 'Handler_tmp%';
|
|
|
|
FLUSH STATUS;
|
|
SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5
|
|
FROM t1, t2 AS alias2, t2 AS alias3
|
|
WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 )
|
|
GROUP BY field1, field2, field3, field4, field5
|
|
LIMIT ROWS EXAMINED 124;
|
|
SHOW STATUS LIKE 'Handler_read%';
|
|
SHOW STATUS LIKE 'Handler_tmp%';
|
|
|
|
drop table t1, t2;
|
|
|
|
--echo
|
|
--echo MDEV-161 LIMIT_ROWS EXAMINED: query with the limit and NOT EXISTS, without GROUP BY or aggregate,
|
|
--echo returns rows, while the same query without the limit returns empty set
|
|
--echo
|
|
|
|
CREATE TABLE t1 ( a INT, b INT );
|
|
INSERT INTO t1 VALUES (3911,17),(3847,33),(3857,26);
|
|
|
|
CREATE TABLE t2 ( c VARCHAR(16) );
|
|
INSERT INTO t2 VALUES ('English'),('French'),('German');
|
|
|
|
CREATE TABLE t3 ( d INT, e VARCHAR(32) );
|
|
INSERT INTO t3 VALUES (3813,'United States'),(3814,'United States');
|
|
|
|
SELECT * FROM t1 AS alias1, t2 AS alias2
|
|
WHERE NOT EXISTS (
|
|
SELECT * FROM t1 LEFT OUTER JOIN t3
|
|
ON (d = a)
|
|
WHERE b <= alias1.b OR e != alias2.c
|
|
);
|
|
|
|
SELECT * FROM t1 AS alias1, t2 AS alias2
|
|
WHERE NOT EXISTS (
|
|
SELECT * FROM t1 LEFT OUTER JOIN t3
|
|
ON (d = a)
|
|
WHERE b <= alias1.b OR e != alias2.c
|
|
) LIMIT ROWS EXAMINED 20;
|
|
|
|
drop table t1, t2, t3;
|
|
|
|
--echo
|
|
--echo MDEV-174: LIMIT ROWS EXAMINED: Assertion `0' failed in net_end_statement(THD*)
|
|
--echo with subquery in SELECT, constant table, aggregate function
|
|
--echo
|
|
|
|
CREATE TABLE t1 ( a INT );
|
|
CREATE TABLE t2 ( b INT, c INT, KEY(c) );
|
|
INSERT INTO t2 VALUES
|
|
(5, 0),(3, 4),(6, 1),
|
|
(5, 8),(4, 9),(8, 1);
|
|
|
|
SELECT (SELECT MAX(c) FROM t1, t2)
|
|
FROM t2
|
|
WHERE c = (SELECT MAX(b) FROM t2)
|
|
LIMIT ROWS EXAMINED 3;
|
|
|
|
drop table t1, t2;
|
|
|
|
--echo
|
|
--echo MDEV-178: LIMIT ROWS EXAMINED: Assertion `0' failed in net_end_statement(THD*) on the
|
|
--echo 2nd PS execution, with DISTINCT, FROM subquery or view in SELECT, JOIN in nested subquery
|
|
--echo
|
|
|
|
CREATE TABLE t1 ( a INT );
|
|
INSERT INTO t1 VALUES (2),(3),(150);
|
|
CREATE TABLE t2 ( b INT );
|
|
INSERT INTO t2 VALUES (2),(17),(3),(6);
|
|
|
|
CREATE VIEW v AS
|
|
SELECT DISTINCT * FROM t1 WHERE a > (SELECT COUNT(*) FROM t1, t2 WHERE a = b);
|
|
|
|
PREPARE ps FROM 'SELECT * FROM v LIMIT ROWS EXAMINED 21';
|
|
|
|
EXECUTE ps;
|
|
EXECUTE ps;
|
|
|
|
drop view v;
|
|
drop table t1, t2;
|