zoukankan      html  css  js  c++  java
  • Oracle ocp 12c071最新考试题库及答案1

    choose the best answer:

    View the Exhibit and examine the structure of the CUSTOMERS table.

    CUSTOMER_VU is a view based on CUSTOMERS_BR1 table which has the same structure as CUSTOMERS table.

    CUSTOMERS needs to be updated to reflect the latest information about the customers.

    What is the error in the following MERGE statement?

    MERGE INTO customers c
    USING customer_vu cv
    ON (c.customer_id = cv.customer_id)
    WHEN MATCHED THEN
    UPDATE SET
    c.customer_id = cv.customer_id,
    c.cust_name = cv.cust_name,
    c.cust_email = cv.cust_email,
    c.income_level = cv.income_level
    WHEN NOT MATCHED THEN
    INSERT VALUES(cv.customer_id,cv.cust_name,cv.cust_email,cv.income_level)
    WHERE cv.income_level >100000;

    A) The INTO clause is misplaced in the command.
    B) The WHERE clause cannot be used with INSERT.
    C) CUSTOMER_VU cannot be used as a data source.
    D) The CUSTOMER_ID column cannot be updated

    答案:D

  • 相关阅读:
    1372
    SPOJ
    HDU 3966-Aragorn's Story 树链剖分+树状数组
    LightOJ 1348
    HihoCoder 1568 不一定合法括号序列
    LightOJ 1343
    LightOJ 1266
    LightOJ 1112
    HihoCoder 1328 BFS 搜索
    链表交集、合并、排序
  • 原文地址:https://www.cnblogs.com/cnblogs5359/p/10365582.html
Copyright © 2011-2022 走看看