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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