72
72
select * from t1 where a > 8 and a < 9;
85
75
insert into t2 select * from t1;
86
76
alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
87
77
explain select * from t1 where a is null and b = 2;