OCP 1Z0 051 93

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93. View the Exhibit and examine the structure of the CUSTOMERS table.
Using the CUSTOMERS table, y ou 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;

nvl两个参数的类型应该一致 A B C中都不一致

SQL> SELECT nvl(cust_credit_limit, 'Not Available') * .15 "NEW CREDIT"  2    FROM sh.customers;SELECT nvl(cust_credit_limit, 'Not Available') * .15 "NEW CREDIT"  FROM sh.customersORA-01722: 无效数字SQL> SELECT nvl(cust_credit_limit * .15, 'Not Available') "NEW CREDIT"  2    FROM sh.customers;SELECT nvl(cust_credit_limit * .15, 'Not Available') "NEW CREDIT"  FROM sh.customersORA-01722: 无效数字SQL> SELECT to_char(nvl(cust_credit_limit * .15, 'Not Available')) "NEW CREDIT"  2    FROM sh.customers;SELECT to_char(nvl(cust_credit_limit * .15, 'Not Available')) "NEW CREDIT"  FROM sh.customersORA-01722: 无效数字SQL> SELECT nvl(to_char(cust_credit_limit * .15), 'Not Available') "NEW CREDIT"  2    FROM sh.customers  3   WHERE rownum <= 5;NEW CREDIT----------------------------------------2251050165022513505 rows selected

Answer: D

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