create table t1(a blob unique , b blob , c blob, unique(b,c));
insert into t1 values(1,1,1);
insert into t1 values(2,2,2),(3,3,3),(4,4,4),(5,5,5);
insert into t1 select a+5, b+5, c+5 from t1;
insert into t1 select a+10, b+10, c+10 from t1;
insert into t1 select a+20, b+20, c+20 from t1;
insert into t1 select a+40, b+40, c+40 from t1;
--query_vertical explain select * from t1 where a="1";
--query_vertical explain select * from t1 where b="34" and c = "34";
--query_vertical explain select * from t1 where c="34" and b="34";
--query_vertical explain select * from t1 where c="34";
--query_vertical explain select * from t1 where b="34";
drop table t1;