drop table if exists t1;
create table t1 (a int not null auto_increment, b int not null, primary key(a));
insert into t1 (b) values (2),(3),(5),(5),(5),(6),(7),(9);
select SQL_CALC_FOUND_ROWS * from t1;
a	b
1	2
2	3
3	5
4	5
5	5
6	6
7	7
8	9
select found_rows();
FOUND_ROWS()
8
select SQL_CALC_FOUND_ROWS * from t1 limit 1;
a	b
1	2
select found_rows();
FOUND_ROWS()
8
select SQL_CALC_FOUND_ROWS * from t1 order by b desc limit 1;
a	b
8	9
select found_rows();
FOUND_ROWS()
8
select SQL_CALC_FOUND_ROWS distinct b from t1 limit 1;
b
2
select found_rows();
FOUND_ROWS()
6
select SQL_CALC_FOUND_ROWS b,count(*) as c from t1 group by b order by c desc limit 1;
b	c
5	3
select found_rows();
FOUND_ROWS()
6
select SQL_CALC_FOUND_ROWS * from t1 left join t1 as t2 on (t1.b=t2.a) limit 2,1;
a	b	a	b
3	5	5	5
select found_rows();
FOUND_ROWS()
8
drop table t1;