diff options
Diffstat (limited to 'mysql-test/r/join.result')
| -rw-r--r-- | mysql-test/r/join.result | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mysql-test/r/join.result b/mysql-test/r/join.result index 75daa0fd46d..897ec4f7a6a 100644 --- a/mysql-test/r/join.result +++ b/mysql-test/r/join.result @@ -776,3 +776,31 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL a,b NULL NULL NULL 1000 Using where 1 SIMPLE t3 ref b b 5 test.t2.b 1 Using where drop table t1, t2, t3; +create table t1 (a int); +insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t2 (a int, b int, primary key(a)); +insert into t2 select @v:=A.a+10*B.a, @v from t1 A, t1 B; +explain select * from t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 +show status like '%cost%'; +Variable_name Value +Last_query_cost 4.016090 +select 'The cost of accessing t1 (dont care if it changes' '^'; +The cost of accessing t1 (dont care if it changes +The cost of accessing t1 (dont care if it changes^ +select 'vv: Following query must use ALL(t1), eq_ref(A), eq_ref(B): vv' Z; +Z +vv: Following query must use ALL(t1), eq_ref(A), eq_ref(B): vv +explain select * from t1, t2 A, t2 B where A.a = t1.a and B.a=A.b; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 +1 SIMPLE A eq_ref PRIMARY PRIMARY 4 test.t1.a 1 +1 SIMPLE B eq_ref PRIMARY PRIMARY 4 test.A.b 1 +show status like '%cost%'; +Variable_name Value +Last_query_cost 24.016090 +select '^^: The above should be ~= 20 + cost(select * from t1). Value less than 20 is an error' Z; +Z +^^: The above should be ~= 20 + cost(select * from t1). Value less than 20 is an error +drop table t1, t2; |