Find the total number of hours have done for all students in each department.
SELECT sum(stu_hrs) ,  dept_code FROM student GROUP BY dept_code
SELECT sum(stu_hrs) ,  dept_code FROM student GROUP BY dept_code
[{'sum(stu_hrs)': 165, 'DEPT_CODE': 'ACCT'}, {'sum(stu_hrs)': 42, 'DEPT_CODE': 'BIOL'}, {'sum(stu_hrs)': 147, 'DEPT_CODE': 'CIS'}, {'sum(stu_hrs)': 120, 'DEPT_CODE': 'EDU'}, {'sum(stu_hrs)': 102, 'DEPT_CODE': 'ENGL'}]