What is the name, address, and number of students in the departments that have the 3 most students?
SELECT T2.dept_name ,  T2.dept_address ,  count(*) FROM student AS T1 JOIN department AS T2 ON T1.dept_code  =  T2.dept_code GROUP BY T1.dept_code ORDER BY count(*) DESC LIMIT 3
departments that have the 3 most students refers to TOP 3 COUNT(students) in each department; name, address, and number of students in departments refers to dept_name, dept_address, and COUNT(*) respectively;