Chinaunix首页 | 论坛 | 博客
  • 博客访问: 16397
  • 博文数量: 36
  • 博客积分: 0
  • 博客等级: 民兵
  • 技术积分: 210
  • 用 户 组: 普通用户
  • 注册时间: 2021-11-30 10:47
文章分类
文章存档

2022年(28)

2021年(8)

我的朋友

分类: Oracle

2022-01-13 17:43:23

13.You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.

The variables used in your query are never undefined in your session.

Which query can be used?

A. SELECT &&col1, &&col2FROM &table WHERE &&condition = &&cond;

B. SELECT &col1, &col2FROM &&table WHERE &condition;

C. SELECT &col1, &col2FROM “&table” WHERE &condition;

D. SELECT ‘&&col1’, ‘&&col2’FROM &table WHERE ‘&&condition’ = ‘&cond’;

E. SELECT &&col1, &&col2FROM &table WHERE &&condition;

Source : cuug

阅读(190) | 评论(0) | 转发(0) |
给主人留下些什么吧!~~