多項(xiàng)選擇題以下是T-SQL語言注釋符號(hào)的是()。

A.--
B./**/
C.//
D.’’


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1.多項(xiàng)選擇題以下關(guān)于COMPUTE和COMPUTE BY的SQL語句錯(cuò)誤的是()。

A.SELECT * FROM [order details] ORDER BY Product ID ,Employeeid COMPUTESUM(quantity)
B.SELECT * FROM [order details] ORDER BY Product lD ,Employeeid COMPUTESUM(quantity)BY ProductID
C.SELECT * FROM [order details] ORDER BY Product ID ,Employeeid COMPUTESUM(quantity)BY Employeeid
D.SELECT * FROM [order details] ORDER BY Product ID ,Employeeid COMPUTESUM(quantity)BY Employeeid ,Product ID


2.多項(xiàng)選擇題以下關(guān)于分組函數(shù)描述錯(cuò)誤的是()。

A.行數(shù)統(tǒng)計(jì)函數(shù)count(*)和count(字段)的結(jié)果一樣
B.sum函數(shù)可以用來統(tǒng)計(jì)某一字段的總和
C.max函數(shù)和min函數(shù)分別用來統(tǒng)計(jì)某一字段的最大值和最小值
D.avg函數(shù)可以用來統(tǒng)計(jì)某一字段的最小平均值