OCP-1Z0-051-题目解析-第4题

4. Which two statements are true regarding single row functions? (Choose two.)

A. They a ccept only a single argument.

B. They can be nested only to two levels.

C. Arguments can only be column values or constants.

D. They a lways 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.

Answer: DE

题目解析：

A：单行函数只能接受一个参数（错误，例如to_date(‘20120304‘, ‘yy-mm-dd‘) 就有两个参数)

B: 单行函数只能被嵌套两级（错误，可以被多级嵌套）

C: 单行函数的参数只能是字段或者常量（错误，参数还可以是变量或者表达式）

D：每一行只能返回一个结果（正确，这是单行函数的特征）

E: 单行函数的返回值的数据类型可以和之前的引用值不同（正确，例如数据类型转换函数，to_char、to_date等）

OCP-1Z0-051-题目解析-第4题

时间： 2024-10-13 19:32:35

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