523
523
id select_type table type possible_keys key key_len ref rows Extra
524
524
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
525
525
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
527
529
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
529
531
id select_type table type possible_keys key key_len ref rows Extra