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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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SQL code:
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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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SQL code:
select a.s#
from sc a join sc b on a.s#=b.s#
where a.c#='001' and b.c#='002' and a.score>b.score
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DateTime endTime=DateTime(em_2.Text)
string sql
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id parentid name
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2 0
3 1
4 3
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