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Student(S#,Sname,Sage,Ssex) ѧÉú±í 
Course(C#,Cname,T#) ¿Î³Ì±í 
SC(S#,C#,score) ³É¼¨±í 
Teacher(T#,Tname) ½Ìʦ±í 
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select a.S# from (select s#,score from SC where C#='001') a,(select s#,score 
from SC where C#='002') b 
where a.score>b.score and a.s#=b.s#; 
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    select S#,avg(score) 
    from sc 
    group by S# having avg(score) >60; 
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select Student.S#,Student.Sname,count(SC.C#),sum(score) 
from Student left Outer join SC on Student.S#=SC.S# 
group by Student.S#,Sname 
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select count(distinct(Tname)) 
from Teacher 
where Tname like 'Àî%'; 
5¡¢²éѯûѧ¹ý“Ҷƽ”ÀÏʦ¿ÎµÄͬѧµÄѧºÅ¡¢ÐÕÃû£» 
    select Student.S#,Student.Sname 
    from Student   
    where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ'); 
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select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#='001'and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#='002'); 
7¡¢²éѯѧ¹ý“Ҷƽ”ÀÏʦËù½ÌµÄËùÓпεÄͬѧµÄѧºÅ¡¢ÐÕÃû£» 
select S#,Sname 
from Student 
where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname='Ҷƽ')); 
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