A、DELETE FROM SC JOIN Student b ON S.Sno = b.Sno<br>WHERE Sdept = '计算机系'
B、DELETE FROM SC FROM SC JOIN Student b ON SC.Sno = b.Sno<br>WHERE Sdept = '计算机系'
C、DELETE FROM Student WHERE Sdept = '计算机系'
D、DELETE FROM SC WHERE Sdept = '计算机系'