用SQL语言写出操作:把数学系全体学生的成绩置零。
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参考答案:
UPDATE SC SET Grade =0 WHERE 'MA '=(SELECT Sdept FROM Student WHERE Student. Sno = SC. Sno)UPDATE SC SET Grade =0 WHERE 'MA '=(SELECT Sdept FROM Student WHERE Student. Sno = SC. Sno)
软考中级