OCP-1Z0-051-题目解析-第24题

24. Examine the structure proposed for the TRANSACTIONS table:

name Null Type

TRANS_ID NOT NULL NUMBER(6)

CUST_NAME NOT NULL VARCHAR2(20)

CUST_STATUS NOT NULL VARCHAR2

TRANS_DATE NOT NULL DATE

TRANS_VALIDITY INTERVAL DAY TO SECOND

CUST_CREDIT_VALUE NUMBER(10)

Which two statements are true regarding the storage of data in the above table structure? (Choose two.)

A. The TRANS_DATE column would allow storage of dates only in the dd-mon-yyyy format.

B. The CUST_CREDIT_VALUE column would allow storage of positive and negative integers.

C. The TRANS_VALIDITY column would allow storage of a time interval in days, hours, minutes, and seconds.

D. The CUST_STATUS column would allow storage of data up to the maximum VARCHAR2 size of 4,000 characters.

Answer: BC

A: TRANS_DATE字段只能存储如dd-mon-yyyy格式的数据。（错误，Date数据类型可以精确的秒，如dd-mon-yyyy HH24:MI:SS)

B: CUST_CREDIT_VALUE字段能存储正整数和负整数。（正确）

C: TRANS_VALIDITY字段能存储包含天、小时、分钟、秒的时间段（正确）

D: CUST_STATUS 字段最大能存储4000个字符。（错误，没有指定最大值，会报错）

这道题可以参见上道题：/article/7691644.html