Oracle 同义词synonym 学习
Oracle 同义词synonym 学习,此外如果要创建一个远程的数据库上的某张表的同义词,需要先创建一个Database Link(数据库连接)来扩
同义词:从字面上理解就是别名的意思,和试图的功能类似。就是一种映射关系。
(1.创建同义词语句:
create public synonym table_name for user.table_name;
其中第一个 table_name和第二个 table_name 可以不一样。
此外如果要创建一个远程的数据库上的某张表的同义词,,需要先创建一个Database Link(数据库连接)来扩展访问,然后在使用如下语句创建数据库同义词:
create synonym table_name for table_name@DB_Link;
当然,你可能需要在user用户中给当前用户(user2)授权: grant select/delete/update on user2
工作使用实例:
给当前用户创建一同义词TBL_USERS ,映射的表是 数据库lsxy(一个dblink)上用户 lisi 下的V_TBL_USERS 表。
create or replace synonym TBL_USERS for lisi.V_TBL_USERS@ lsxy;
(2.删除同义词:
drop public synonym table_name;
(3.查看所有同义词:
select * from dba_synonyms;
同义词拥有如下好处:
1、节省大量的数据库空间,对不同用户的操作同一张表没有多少差别;
2、扩展的数据库的使用范围,能够在不同的数据库用户之间实现无缝交互;
3、同义词可以创建在不同数据库服务器上,通过网络实现连接。
更多Oracle相关信息见Oracle 专题页面 ?tid=12

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]
