129. Which three statements are true regarding group functions? (Choose three.)
A. They can be used on columns or expressions.
B. They can be passed as an argument to another group function.
C. They can be used only with a SQL statement that has the GROUP BY clause.
D. They can be used on only one column in the SELECT clause of a SQL statement.
E. They can be used along with the singlerow function in the SELECT clause of a SQL statement.
Answer: ABE
请教各位，B答案说的一个分组函数作为另一个分组函数的参数，如何举例。
谢！
A. They can be used on columns or expressions.
B. They can be passed as an argument to another group function.
C. They can be used only with a SQL statement that has the GROUP BY clause.
D. They can be used on only one column in the SELECT clause of a SQL statement.
E. They can be used along with the singlerow function in the SELECT clause of a SQL statement.
Answer: ABE
请教各位，B答案说的一个分组函数作为另一个分组函数的参数，如何举例。
谢！
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