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  • 【ocp-071】You need to write a query that does the following tasks:

    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;

    条件语句,不能用别名做条件。ACD都是用别名做条件。因此排除

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  • 原文地址:https://www.cnblogs.com/catherine007/p/13854327.html
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