题目内容

按照班级CLASSES进行分组( )

A. ORDER BY CLASSES
B. ORDER CLASSES
C. GROUP BY CLASSES
D. GROUP CLASSES

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以下语句不正确的是( )

A. select * from emp;
B. select ename,hiredate,sal from emp;
C. select * from emp order deptno;
D. select * from where deptno=1

以下聚合函数求平均值的是()

A. MAX
B. IF
CASE
D. AVG

以下聚合函数计数的是( )

A. COUNT
B. MAX
C. AVG
D. SUM

以下哪项用来分组查询( )

A. ORDER BY
B. ORDERED BY
C. GROUP BY
D. GROUPED BY

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