OCP的071考試難考？以前確實不容易通過，但現在我們對071考試題庫進行了收集整理，并給出了答案，已經幫助很多考生順利通過了071考試。
--------------------------------------------
071題庫整理-第65題、choose the best answer:
The CUSTOMERS table has the following structure:
You need to write a query that does the following tasks:
1. Display the first name and tax amount of the customers. Tax is 5% of their credit limit.
2. Only those customers whose income level has a value should be considered.
3. Customers whose tax amount is null should not be considered.
Which statement accomplishes all the required tasks?
A) SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT
FROM customers
WHERE (cust_income_level,tax_amount) IS NOT NULL;
B) SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL AND
cust_credit_limit IS NOT NULL;
C) SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT
FROM customers
WHERE cust_income_level <> NULL AND
tax_amount <> NULL;
D) SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL AND
tax_amount IS NOT NULL;
Answer：B
(解析：條件語句中不能用別名當做條件，該題的題意是稅額不能為 0，所以只要 cust_credit_limit 不為 0，則保證稅額不會為 0
-----------------------------------------------
OCP解析公開課時間：【每周五晚8點】
OCP解析公開課地址：https://ke.qq.com/course/326223
OCP解析群資料分享：1015267481 驗證：ocp
另外，除了OCP公開課，OCM題庫直播也同步進行中，OCM最新題庫大爆料-【每周四晚8點】，【微信群直播】，可以聯系咨詢老師進群參與
