OCP-1Z0-新051-61题版本-38

QUESTION NO: 38

See the Exhibit and Examine the structure of the CUSTOMERS table:

Using the CUSTOMERS table, you need to generate a report that shows an increase in the credit

limit by 15% for all customers. Customers whose credit limit has not been entered should have the

message "Not Available" displayed.

Which SQL statement would produce the required result?

A. SELECT NVL(cust_credit_limit,'Not Available')*.15 "NEW CREDIT" FROM customers;

B. SELECT NVL(cust_credit_limit*.15,'Not Available') "NEW CREDIT" FROM customers;

C. SELECT TO_CHAR(NVL(cust_credit_limit*.15,'Not Available')) "NEW CREDIT" FROM

customers;

D. SELECT NVL(TO_CHAR(cust_credit_limit*.15),'Not Available') "NEW CREDIT" FROM customers;

Answer: D

答案解析：

参考：93：http://blog.csdn.net/rlhua/article/details/11805803

Explanation:

NVL Function

Converts a null value to an actual value:

Data types that can be used are date, character, and number.

Data types must match:

– NVL(commission_pct,0)

– NVL(hire_date,'01-JAN-97')

– NVL(job_id,'No Job Yet')