假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GmD
假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GmDE)。要查找选修“COViPUTER”课程的“女”学生姓名,将涉及到关系______。
A.S
B.SC,C
C.S,SC
D.S,C,SC
假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GmDE)。要查找选修“COViPUTER”课程的“女”学生姓名,将涉及到关系______。
A.S
B.SC,C
C.S,SC
D.S,C,SC
A.S
B.S,SC
C.C,SC
D.S,C,SC
A、SELECT S#,SUM(GRADE) as Sgrade FROM SC WHERE GRADE>=60 GROUP BY S# HAVING COUNT(*)>=4 ORDER BY Sgrade DESC
B、SELECT S#,SUM(GRADE) as Sgrade FROM SC WHERE GRADE>=60 GROUP BY S# HAVING COUNT(*)>=4 ORDER BY Sgrade
C、SELECT S#,SUM(GRADE) as Sgrade FROM SC WHERE GRADE>=60 HAVING COUNT(*)>=4 GROUP BY S# ORDER BY Sgrade DESC
D、SELECT S#,SUM(GRADE) as Sgrade FROM SC WHERE GRADE>=60 and COUNT(*)>=4 GROUP BY S# ORDER BY Sgrade DESC
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