584
597
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index
585
598
select * from t1 where a <> -1;
588
601
explain select * from t1 where a > -1 or a < -1;
589
602
id select_type table type possible_keys key key_len ref rows Extra
590
603
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index