diff options
Diffstat (limited to 'mysql-test/r/explain_non_select.result')
-rw-r--r-- | mysql-test/r/explain_non_select.result | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/mysql-test/r/explain_non_select.result b/mysql-test/r/explain_non_select.result index aa592f0b198..1c8e444c4b9 100644 --- a/mysql-test/r/explain_non_select.result +++ b/mysql-test/r/explain_non_select.result @@ -38,7 +38,7 @@ id select_type table type possible_keys key key_len ref rows Extra explain delete from t1 where a < (select max(a) from t0); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 range a a 5 NULL 1 Using where -2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Query plan already deleted +2 SUBQUERY t0 ALL NULL NULL NULL NULL 8 explain delete from t1 where a < (select max(a) from t0 where a < t1.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 512 Using where @@ -51,3 +51,54 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL NULL NULL NULL NULL 8 Using where 1 SIMPLE t1 ref a a 5 test.t0.a 4 Using index drop table t0, t1; +# ################################################################### +# ## EXPLAIN UPDATE tests +# ################################################################### +create table t0 (a int) engine=myisam; +insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8); +explain update t0 set a=3 where a=4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 ALL NULL NULL NULL NULL 8 Using where +create table t1 (a int, b int, filler char(100), key(a), key(b)); +insert into t1 +select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' +from t0 A, t0 B, t0 C; +explain update t1 set a=a+1 where 3>4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible where +explain update t1 set a=a+1 where a=3 and a=4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible where +# This should use an index, possible_keys=NULL because there is no WHERE +explain update t1 set a=a+1 order by a limit 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 512 +# This should use range, possible_keys={a,b} +explain update t1 set filler='fooo' where a<20 and b < 10; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a,b a 5 NULL 1 Using where +# This should use ALL + filesort +explain update t1 set filler='fooo' order by a+1 limit 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 512 +# This should use range + using filesort +explain update t1 set filler='fooo' where a<20 order by b limit 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 1 Using where +# Try some subqueries: +explain update t1 set filler='fooo' where a < (select max(a) from t0); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 range a a 5 NULL 1 Using where +2 SUBQUERY t0 ALL NULL NULL NULL NULL 8 +explain update t1 set filler='fooo' where a < (select max(a) from t0 where a < t1.b); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 512 Using where +2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 8 Using where +# +# Tests for multi-table UPDATE +# +explain update t0, t1 set t1.a=t1.a+1 where t0.a = t1.a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 ALL NULL NULL NULL NULL 8 Using where +1 SIMPLE t1 ref a a 5 test.t0.a 4 Using index +drop table t0, t1; |