对列或表达式计算最大值和最小值的函数是()。A.max和minB.sumC.countD.avg
A. max和min
B. sum
C. count
D. avg
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对列或表达式计算总和的函数是()。A.max和minB.sumC.countD.avg
A. max和min
B. sum
C. count
D. avg
对列或表达式计算平均值的函数是()。A.max和minB.sumC.countD.avg
A. max和min
B. sum
C. count
D. avg
统计记录总数的函数是()。A.max和minB.sumC.countD.avg
A. max和min
B. sum
C. count
D. avg
如果查询的select子句为select A,B,C*D ,则不能使用的group by子句是(C)。A. group by AB. group by A,BC. group by A,B,C*DD. group by A,B,C,D
A. group by A
B. group by A,B
C. group by A,B,C*D
D. group by A,B,C,D