【OCP认证12c题库】CUUG 071题库考试原题及答案(25)
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
- 【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 ...
- 【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 ...
- 【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_ ...
- 【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 ...
- 【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 ...
- 【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 ...
- 【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 ...
- 【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 ...
- 【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
- 设置myeclipse文件的打开格式
- Vue cli 脚手架使用
1:基本的安装 安装node 安装npm Windows 更改环境变量 重启 环境变量生效 安装vue-cli 安装webpack 2:项目构建 https://segmentfault.com/a/ ...
- S 合伙人
[Public] ConnectString=host="siebel://10.10.0.46:2321/HC_CRM/SMObjMgr_chs ConnectUserName=SADMI ...
- freemaker在表格中遍历数据
Controller层如下所示: @RequestMapping(value = "/test", method = RequestMethod.GET) public Strin ...
- MySQL学习2---索引
MySQL 索引 MySQL索引的建立对于MySQL的高效运行是很重要的,索引可以大大提高MySQL的检索速度. 索引分单列索引和组合索引.单列索引,即一个索引只包含单个列,一个表可以有多个单列索引, ...
- memcached的常用命令
memcached 常用命令及使用说明 1.启动Memcache 常用参数 -p <num> 设置TCP端口号(默认设置为: 11211) -U <num> UDP监听端口 ...
- Ubuntu18.04安装Virtualenv虚拟环境
在Ubuntu18.04安装Virtualenv虚拟环境 [实验环境]: 在这台电脑上已经安装了python3 [安装参考] 1.查看是否已安装virtualenv virtualenv --vers ...
- Golang学习系列:(一)介绍和安装
Golang学习系列:(一)介绍和安装 Java程序员带你来到Go的世界,让我们开始探索吧! Go是一种新的语言,一种并发的,带有垃圾回收的.快速编译的语言,它具有一下特点: 他可以在一台计算机上用几 ...
- 无生物学重复RNA-seq分析 CORNAS: coverage-dependent RNA-Seq analysis of gene expression data without biological replicates
无生物学重复RNA-seq分析 CORNAS: coverage-dependent RNA-Seq analysis of gene expression data without biologic ...
- Laravel 文件上传失败的问题 error 7
一个站点上传文件失败 error为7 UPLOAD_ERR_CANT_WRITE 临时文件上传不上 $_FILE打出来 Array( [file] => Array ( ...