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单项选择题What is true of using group functions on columns that contain NULL values?（）

A、Group functions on columns ignore NULL values.

B、Group functions on columns returning dates include NULL values.

C、Group functions on columns returning numbers include NULL values.

D、Group functions on columns cannot be accurately used on columns that contain NULL values.

E、Group functions on columns include NULL values in calculations if you use the keyword INC_NULLS.

  • A

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