请选择 进入手机版 | 继续访问电脑版

北京oracle培训_oracle培训哪家好_CUUG官方论坛_CUUG培训怎么样_CUUG官网

 找回密码
 立即注册

QQ登录

只需一步,快速开始

搜索
查看: 4169|回复: 0

Oracle OCP 19c 认证1Z0-082考试题库(第16题)

[复制链接]

360

主题

401

好友

2万

积分

管理员

Rank: 9Rank: 9Rank: 9

发表于 2021-5-7 15:46:09 |显示全部楼层
Oracle OCP 19c 认证1Z0-082考试题库(第16题)-CUUG内部学员版082题库解析
16.Which three statements are true about dropping and unused columns in an Oracle database?(Choose three.)
A. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
B. An UNUSED column’s space is reclaimed automatically when the block containing that column is next queried.
C. An UNUSED column’s space is reclaimed automatically when the row containing that column is next queried.
D. Partition key columns cannot be dropped.
E. A DROP COLUMN command can be rolled back
F. A column that is set to UNUSED still counts towards the limit of 1000 columns per table

回复

使用道具 举报

您需要登录后才可以回帖 登录 | 立即注册

QQ|手机版|CUUG认证培训 ( 京ICP备11008061号 )  

GMT+8, 2021-11-29 05:15 , Processed in 0.021916 second(s), 22 queries .

Powered by Discuz! X2.5

© 2001-2012 Comsenz Inc.

回顶部