[转]oracle 同义词 synonym

时间：2014-04-30 00:44:03 收藏：0 阅读：627

本文转自：http://blog.csdn.net/generalfu/article/details/7906561

同义词定义 当一个用户想访问另外一个用户的表时，需要在表前加用户名，总加表名不方便，为此可以为用户名、表名起个小名别名，以方便访问，此别名就是同义词。
创建同义词 create synonym 同义词名 for 用户名.表名称;

删除同义词 drop synonym syn_name;

测试实例 --没有创建同义词之前

[sql] view plain copy print ?

SQL> select * from scott.emp where deptno = 10;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
7782 CLARK MANAGER 7839 1981-6-9 2450.00 10
7839 KING PRESIDENT 1981-11-17 5000.00 10
7934 MILLER CLERK 7782 1982-1-23 1300.00 10
Executed in 0.078 seconds

SQL> select * from scott.emp where deptno = 10;
 
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
 7782 CLARK      MANAGER    7839 1981-6-9      2450.00               10
 7839 KING       PRESIDENT       1981-11-17    5000.00               10
 7934 MILLER     CLERK      7782 1982-1-23     1300.00               10
 
Executed in 0.078 seconds

--创建同义词

[sql] view plain copy print ?

SQL> create synonym myemp for scott.emp;
Synonym created
Executed in 0.265 seconds

SQL> create synonym myemp for scott.emp;
 
Synonym created
 
Executed in 0.265 seconds

--使用同义词

[sql] view plain copy print ?

SQL> select * from myemp where deptno = 10;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
7782 CLARK MANAGER 7839 1981-6-9 2450.00 10
7839 KING PRESIDENT 1981-11-17 5000.00 10
7934 MILLER CLERK 7782 1982-1-23 1300.00 10
Executed in 0.047 seconds

[转]oracle 同义词 synonym,布布扣,bubuko.com