67
explain select * from t1 where a in (869751,736494,226312,802616);
67
explain select * from t2 where a in (869751,736494,226312,802616);
68
68
id select_type table type possible_keys key key_len ref rows Extra
71
71
create table t1 (x int not null, y int not null, key x (x), unique y (y))
73
73
insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);