Examine the description of the STUDENTS table:Which two aggregate functions are valid on the START_DATE column?()A. SUM(start_date)B. AVG(start_date)C. COUNT(start_date)D. AVG(start_date, end_date)E. MIN(start_date)F. MAXIMUM(start_date)

题目
Examine the description of the STUDENTS table:Which two aggregate functions are valid on the START_DATE column?()

A. SUM(start_date)

B. AVG(start_date)

C. COUNT(start_date)

D. AVG(start_date, end_date)

E. MIN(start_date)

F. MAXIMUM(start_date)

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    参考答案：being examined

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    设置多列布局的属性值为（）。

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    C．column-gap

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