130. Which three statements are true regarding single-row functions? (Choose
three.)
A. They can accept only one argument.
B. They can be nested up to only two levels.
C. They can return multiple values of more than one data type.
D. They can be used in SELECT, WHERE, and ORDER BY clauses.
E. They can modify the data type of the argument that is referenced.
F. They can accept a column name, expression, variable name, or a usersupplied
constant as arguments.
Answer: DEF
Constant:不变的 reference:提及
single-row function指一行数据输入，返回一个值的函数。 如substr等。
而mutil-row function指多行数据输入，返回一个值的函数。 如sum、max等
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