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【单选题】在SELECT语句中使用GROUP BY SNO时,SNO必须（)。
A．在WHERE中出现
B．在FROM中出现
C．在SELECT中出现
D．在HAVING中出现
参考答案和解析
D
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假定学生关系是S(SNO，SNAME，SEX，AGE)，其属性是学号，姓名，性别，年龄；课程关系是C(CNO，CNAME)，属性是课程号，课程名；学生选课关系是SC(SNO，CNO，GRADE)，属性是学号，课程号，成绩。要查找选修“COMPUTER”课程的“女”学生姓名，将涉及到关系有（）、（）、（），SQL语句为：SELECT SNAME FROM WHERE S.SNO=SC.SNO AND SC.CNO=C.CNO AND（）；查询所有课程都及格的学生学号，姓名，SQL语句为：SELECT SNO, SNAME FROM（）WHERE（） (SELECT * FROM SC WHERE S.SNO=SC.SNO AND （）)。
考题
下列查询语句中，错误的是（）。A、SELECT Sno， COUNT（*） FROM SC GROUP BY SnoB、SELECT Sno FROM SC GROUP BY Sno WHERE COUNT（*） 3C、SELECT Sno FROM SC GROUP BY Sno HAVING COUNT（*） 3D、SELECT Sno FROM SC GROUP BY Sno
考题
单选题下列查询语句中，错误的是（）。A
SELECT Sno， COUNT（*） FROM SC GROUP BY SnoB
SELECT Sno FROM SC GROUP BY Sno WHERE COUNT（*） 3C
SELECT Sno FROM SC GROUP BY Sno HAVING COUNT（*） 3D
SELECT Sno FROM SC GROUP BY Sno
考题
单选题在SELECT语句中使用GROUPBYSNO时，SNO必须（）A
在WHERE中出现B
在FROM中出现C
在SELECT中出现D
在HAVING中出现
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