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多项选择题
A.from
B.orderby
C.groupby
D.where
多项选择题
A.select s.s#,sname from s where s.s#=(selectsc.s#fromscwherec#=’c2’
B.select s.s#,sname from s,s cwhere s.s#=sc.s#andc#=’c2’
C.select s.s#,sname from s joinscon s.s#=sc.s#wherec#=’c2’
D.select s.s#,sname from s where s.s#in(selectsc.s#fromscwherec#=’c2’)