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30、请选择两项。
CUSTOMERS表有一个数据类型为NUMBER的CUST_CREDIT_LIMIT列。
哪两个查询将, 成功执行?
A) SELECT TO_CHAR(NVL(cust_credit_limit * .15, 'Not Available')) FROM customers;
B) SELECT NVL(TO_CHAR(cust_credit_limit * .15), 'Not Available') FROM customers;
C) SELECT NVL2(cust_credit_limit * .15, 'Not Available') FROM customers;
D) SELECT NVL(cust_credit_limit * .15, 'Not Available') FROM customers;
E) SELECT NVL2(cust_credit_limit, TO_CHAR(cust_credit_limit * .15), 'Not Available') FROM customers;