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47 lines
1.2 KiB
Text
47 lines
1.2 KiB
Text
#
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# MariaDB tests for EXPLAIN UPDATE/DELETE.
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#
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--disable_warnings
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drop table if exists t0;
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--enable_warnings
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create table t0 (a int) engine=myisam;
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insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
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--echo #
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--echo # Tests for single-table DELETE
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--echo #
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explain select * from t0 where a=3;
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explain delete from t0 where a=3;
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--echo # DELETE without WHERE is a special case:
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explain delete from t0;
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create table t1 (a int, b int, filler char(100), key(a), key(b));
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insert into t1
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select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler'
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from t0 A, t0 B, t0 C;
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--echo # This should use an index, possible_keys=NULL because there is no WHERE
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explain delete from t1 order by a limit 2;
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--echo # This should use range, possible_keys={a,b}
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explain delete from t1 where a<20 and b < 10;
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--echo # This should use ALL + filesort
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explain delete from t1 order by a+1 limit 2;
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--echo # This should use range + using filesort
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explain delete from t1 where a<20 order by b limit 2;
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--echo # Try some subqueries:
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explain delete from t1 where a < (select max(a) from t0);
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explain delete from t1 where a < (select max(a) from t0 where a < t1.b);
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--echo #
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--echo # Tests for multi-table DELETE
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--echo #
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explain delete t1 from t0, t1 where t0.a = t1.a;
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drop table t0, t1;
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