Which department has the highest average student GPA, and what is the average gpa?
SELECT T2.dept_name ,  avg(T1.stu_gpa) FROM student AS T1 JOIN department AS T2 ON T1.dept_code  =  T2.dept_code GROUP BY T1.dept_code ORDER BY avg(T1.stu_gpa) DESC LIMIT 1
highest average student GPA refers to MAX(AVG(stu_gpa)); department refers to dept_name; average GPA refers to AVG(stu_gpa); JOIN operation is used to link department and student tables on dept_code;