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对于教学数据库的三个基本表: S(SNo,SName,SAge,Ssex) SC(Sno,CNo,Grade) C(CNo,CName,Teacher) 使用SQL更新语句表达对下列的更新操作...

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SELECT Sname  FROM S,SC,C  WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher=’LIU’AND Ssex  =’F’  SELECT Sname  FROM S WHERE Ssex=’F’AND Sno IN  (SELECT Sno  FROM SC  WHERE Cno IN(SELECT Cno FROM C  WHFRF Teacher=’LIU’))  SELECT Sname  FROM S WHERE Ssex=’F’ AND EXISTS(SELECT*  FROM SC  WHERE SC.Sno=S.Sno AND EXISTS  
SELECT Sname FROM S,SC,C WHERE Sno=SSno AND SCno=Cno AND Teacher=‘LIU’AND Ssex=‘F’  SELECT Sname FROM S WHERE Ssex=‘F’AND Sno IN (SELECT Sno FROM SC WHERE Cno IN(SELECT Cno FROM C WHERE Teacher=‘LIU’))  SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS (SELECT* FROM SC WHERE SSno=Sno AND EXISTS (SELECT* FROM C WHERE Teacher=‘LIU’))  SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS(SELECT* FROM SC WHERE SSno=Sno AND EXISTS (SELECT* FROM C WHERE Cno=SCno AND Teacher=‘LIU’))  

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