Can you tell me how many teachers teach fifth grade?
select count ( distinct t2.lastname ) from list as t1 join teachers as t2 on t1.classroom = t2.classroom where grade = 5
What is that teacher's last name?
select distinct t2.lastname from list as t1 join teachers as t2 on t1.classroom = t2.classroom where grade = 5
What classroom does this teacher teach in?
select distinct t2.classroom from list as t1 join teachers as t2 on t1.classroom = t2.classroom where grade = 5