25. choose the best answer

Evaluate the following SQL statement:

ALTER TABLE hr.emp

SET UNUSED (mgr_id);

Which statement is true regarding the effect of the above SQL statement?

A) Any views created on the EMP table that include the MGR_ID column would be automatically modified and remain valid.

B) Any constraints defined on the MGR_ID column would be removed by the above command.

C) Any synonym existing on the EMP table would have to be re-created.

D) Any index created on the MGR in column would continue to exist until the DROP UNUSED COLUMNS command is executed.

Answer:B

(注意:列一旦被设置为 unused 以后,基于该列的约束、索引都被删除,同时相关的视图被无法访问。)

【OCP认证12c题库】CUUG 071题库考试原题及答案(25)的更多相关文章

  1. 【OCP认证12c题库】CUUG 071题库考试原题及答案(28)

    28.choose the best answer Evaluate the following SQL statement: SQL> SELECT promo_id, promo_categ ...

  2. 【OCP认证12c题库】CUUG 071题库考试原题及答案(27)

    27.choose two The SQL statements executed in a user session are as follows: SQL> CREATE TABLE pro ...

  3. 【OCP认证12c题库】CUUG 071题库考试原题及答案(26)

    26.choose two Examine the structure of the PRODUCTS table. Which two statements are true? A) EXPIRY_ ...

  4. 【12c OCP】CUUG OCP认证071考试原题解析(36)

    36.choose the best answer View the Exhibits and examine the structures of the PRODUCTS, SALES, and C ...

  5. 【Oracle 12c】CUUG OCP认证071考试原题解析(35)

    35.choose the best answer View the Exhibit and examine the description of the EMPLOYEES table. Evalu ...

  6. 【12c OCP】CUUG OCP认证071考试原题解析(34)

    34.choose two View the Exhibit and examine the structure of the PRODUCT_INFORMATION and INVENTORIES ...

  7. 【12c OCP】CUUG OCP认证071考试原题解析(33)

    33.choose the best answer View the Exhibit and examine the structure of the ORDER_ITEMS table. Exami ...

  8. 【Oracle 12c】CUUG OCP认证071考试原题解析(32)

    32.choose the best answer View the Exhibit and examine the data in EMP and DEPT tables. In the DEPT ...

  9. 【Oracle 12c】CUUG OCP认证071考试原题解析(31)

    31.choose the best answer Which statement is true regarding the USING clause in table joins? A) It c ...

随机推荐

  1. CB XE7 C11 64位编译器 成员变量初始化

    看到了C++11,看到了XE7的64位,想实现下面方便的类成员初始化,失望. 一.64位用法 clang3,64位编译器,不支持中文变量名,编写代码提示没有32位快,风格简单不用写单独的赋值语句函数, ...

  2. Eclipse can not find the tag library descriptor for http://java.sun.com/jsf/*

    问题页面: <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%> <%@ ta ...

  3. c#正则获取html里面a标签href的值

    获取单个a中href的值: string str = "<a href=\"http://www.itsve.com\">下载</a>" ...

  4. 迷你MVVM框架 avalonjs 1.1发布

    本版本添加了许多有用的功能,得益于用户量的增大,一些隐性BUG也暴露出来Fix掉了.强烈建议升级! 优化扫描流程: ms-skip(0) --> ms-important(1) --> m ...

  5. sdm 使用阿里云域名申请 Let’s Encrypt 通配符 域名证书

    安装acme 进入 套件中心 点击安装 Git Server 之后进入SSh会使用git命令 方法1--------------------------------------- 获取代码 git c ...

  6. JSTL的基本使用

    <body> <% request.setAttribute("name", "lisi123"); request.setAttribute ...

  7. android 读取json数据(遍历JSONObject和JSONArray)(转)

    public String getJson(){ String jsonString = "{\"FLAG\":\"flag\",\"MES ...

  8. 使用java代码编辑oracle数据库

    package com.hanqi; import java.io.IOException; import java.sql.Connection; import java.sql.DriverMan ...

  9. api.besttool.cn 相关接口的返回码code含义列表

    code 含义 0 请求成功 100 接口不存在 101 appid错误 102 secret错误 103 参数错误                    

  10. 11. Container With Most Water 装水最多的容器

    [抄题]: Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ...