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【第65题】OCP认证1Z0-071最新考试题库及答案

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071考试不仅是OCP11g的考试科目，同时也是OCP 12c的考试科目，所以关心071考题的同学有很多，对此我们专门收集整理了近期071考试的原题，并对这些考题进行讲解，希望帮助广大考生顺利通过071考试。

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071考题解析-第65题、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：条件语句中不能用别名当做条件，该题的题意是税额不能为 0，所以只要 cust_credit_limit 不为 0，则保证税额不会为 0

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