中国唯一一家专业只做ARACLE认证和BDA实训的甲骨文金牌合作企业
中国唯一一家专业只做ARACLE认证和BDA实训的甲骨文金牌合作企业
OCP 11g题库详解：1Z0-051-055题，完整题库请点击这里联系老师咨询了解
55. Evaluate the following two queries:
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit IN (1000, 2000, 3000);
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit = 1000 OR cust_credit_limit = 2000 OR cust_credit_limit = 3000;
Which statement is true regarding the above two queries?
A. Performance would improve in query 2.
B. Performance would degrade in query 2.
C. There would be no change in performance.
D. Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT
column.
Answer: C
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