552
552
delete from t2 where a = 2 and b = 'val-2' order by a,b,c,d limit 30;
553
553
explain select c from t2 where a = 2 and b = 'val-2' group by c;
554
554
id select_type table type possible_keys key key_len ref rows Extra
556
556
select c from t2 where a = 2 and b = 'val-2' group by c;