Find the name and address of the department that has the highest number of students.
SELECT T2.dept_name ,  T2.dept_address 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 1
highest number of students refers to MAX(count of students per department); department name and address refers to dept_name and dept_address; joining condition is based on dept_code.