Database: college_2
Question: How many students and instructors are in each department?
SQL: select count(distinct t2.id) ,  count(distinct t3.id) ,  t3.dept_name from department as t1 join student as t2 on t1.dept_name  =  t2.dept_name join instructor as t3 on t1.dept_name  =  t3.dept_name group by t3.dept_name