多选题Which two statements are true regarding single row functions?（）AThey accept only a single argumentBThey can be nested only to two levelsCArguments can only be column values or constantsDThey always return a single result row for every row of a queried tableEThey can return a data type value different from the one that is referenced
多选题
Which two statements are true regarding single row functions?（）
A
They accept only a single argument
B
They can be nested only to two levels
C
Arguments can only be column values or constants
D
They always return a single result row for every row of a queried table
E
They can return a data type value different from the one that is referenced
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