单选题Which statement is true regarding the COALESCE function?（）A It can have a maximum of five expressions in a list B It returns the highest NOT NULL value in the list for all rows C It requires that all expressions in the list must be of the same data typ
题目
单选题
Which statement is true regarding the COALESCE function?（）
A
It can have a maximum of five expressions in a list
B
It returns the highest NOT NULL value in the list for all rows
C
It requires that all expressions in the list must be of the same data type
D
It requires that at least one of the expressions in the list must have a NOT NULL value