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82 lines
2 KiB
PHP
82 lines
2 KiB
PHP
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--echo #
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--echo # Delete with EXISTS subquery over the updated table
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--echo # in WHERE + non-sargable condition
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--echo #
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analyze table t1 persistent for all;
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let $c = exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
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eval create table tmp as select * from t1 where $c;
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let $q = delete from t1 where $c;
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eval explain select * from t1 where $c;
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eval explain $q;
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--enable_info ONCE
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eval $q;
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--sorted_result
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select * from t1;
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insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
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drop table tmp;
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--echo #
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--echo # Delete with order by
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--echo #
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analyze table t1 persistent for all;
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let $c = exists (select 'X' from t1 a where a.c2 = t1.c2)
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and c2 >= 3 order by c2;
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eval create table tmp as select * from t1 where $c;
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let $q = delete from t1 where $c;
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--replace_column 9 #
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eval explain select * from t1 where $c;
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--replace_column 9 #
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eval explain $q;
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--replace_column 9 #
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eval analyze $q;
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--sorted_result
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select * from t1;
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insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
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drop table tmp;
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--echo #
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--echo # Delete from view
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--echo #
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analyze table t1 persistent for all;
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let $c = v1.c1 in
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(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
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eval create table tmp as select * from v1 where $c;
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let $q = delete from v1 where $c;
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eval explain select * from v1 where $c;
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eval explain $q;
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--enable_info ONCE
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eval $q;
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--sorted_result
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select * from t1;
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insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
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drop table tmp;
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--echo #
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--echo # Delete from view using reference
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--echo # to the same view in subquery
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--echo #
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analyze table t1 persistent for all;
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let $c = v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
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and c1 = 2
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and exists (select 'X' from v1 a where a.c1 = v1.c1);
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eval create table tmp as select * from v1 where $c;
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let $q = delete from v1 where $c;
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--replace_column 9 #
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eval explain select * from v1 where $c;
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--replace_column 9 #
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eval explain $q;
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--replace_column 9 #
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eval analyze $q;
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--sorted_result
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select * from t1;
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insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
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drop table tmp;
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