?? select.sql
字號:
select S#,SNAME
from S
where S.S# in(select SC.S#
from SC
where C#='C2');
select S#,SNAME
from S
where S.S# in(select SC.S#
from SC
where SC.C# in(select C.C#
from C
where CNAME='MATHS'));
select SNAME,AGE
from S
where S# not in(select S#
from SC
where C#='C2');
select SNAME
from S
where S# in(select S#
from SC
GROUP BY S#
HAVING count(SC.C#) in(select count(C.C#)
from C));
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