How many departments are there?
select count ( * ) from department
Yes, which department has the fewest members?
select t1.dname from department as t1 join member_of as t2 on t1.dno = t2.dno group by t2.dno order by count ( * ) asc limit 1
How many members does it have?
select count ( * ) from department as t1 join member_of as t2 on t1.dno = t2.dno group by t2.dno order by count ( * ) asc limit 1