题目:下列删除计算机系学生(在student表中)的选修课程记录(在SC表中)的语句,正确的是( )。
A. DELETE FROM SC JOIN Student b ON S.Sno = b.Sno WHERE Sdept = '计算机系'
B. DELETE FROM SC FROM SC JOIN Student b ON SC.Sno = b.Sno 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'
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