已知关系S(S
、SELECT S.SN,S
C、C#,S
C、GRADE FROM S.SC
B、SELECT S.SN,S
C、C#,S
C、GRADE FROM SC WHERE S.S#=S
C、GRADE
C、SELECT S.SN,S
C、C#,S
C、GRADE FROM S,SC WHERE S.S#=S
C、S#
D、SELECT S.SN,S
C、C#,S
C、GRADE FROM S WHERE S.S#=S
C、S#
发布时间：2025-01-30 22:48:31
