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  • OCP-1Z0-新051-61题版本-30

    QUESTION NO: 30

    View the Exhibit and examine the description for the CUSTOMERS table.

    You want to update the CUST_CREDIT_LIMIT column to NULL for all the customers, where

    CUST_INCOME_LEVEL has NULL in the CUSTOMERS table. Which SQL statement will

    accomplish the task?

    A.UPDATE customers SET cust_credit_limit = NULL WHERE CUST_INCOME_LEVEL = NULL;

    B.UPDATE customers SET cust_credit_limit = NULL WHERE cust_income_level IS NULL;

    C.UPDATE customers SET cust_credit_limit = TO_NUMBER(NULL) WHERE cust_income_level = TO_NUMBER(NULL);

    D.UPDATE customers SET cust_credit_limit = TO_NUMBER(' ',9999) WHERE cust_income_level IS NULL;

    Answer: B

    答案解析:

    参考:163:http://blog.csdn.net/rlhua/article/details/12886715

    Explanation: 

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13316217.html
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