OCP-1Z0-051-题目解析-第22题

22. You need to create a table for a banking application. One of the columns in the table has the following requirements:

1) You want a column in the table to store the duration of the credit period.

2) The data in the column should be stored in a format such that it can be easily added and subtracted with

DATE data type without using conversion functions.

3) The maximum period of the credit provision in the application is 30 days.

4) The interest has to be calculated for the number of days an individual has taken a credit for.

Which data type would you use for such a column in the table?

（你需要创建一个银行业务表，其中一个字段有如下要求：

1）该字段需要存储信贷期限的持续时间。

2）不使用转换函数，就可以简单的和Date数据类型加减。

3）应用中信贷发放的最大周期是30天

4）已经拥有信用卡的个人，按天计算利息。）

A. DATE

B. NUMBER

C. TIMESTAMP

D. INTERVAL DAY TO SECOND

E. INTERVAL YEAR TO MONTH

Answer: D

A：Date类型存储的是一个时间点，不是一段时间 （错误）

B：number类型不能和date类型简单的加减 （错误）

C: 和A一样存储的是时间点（错误）

D: 正确

E: 错误，不能精确到天