Oracle字符串中前后包含空格处理方法

一、问题描述

SAM@OCM11G >create table test_space(id int,name varchar2(10));

Table created.

SAM@OCM11G >insert into test_space values (1,'sam');

1 row created.

SAM@OCM11G >insert into test_space values (2,' sam ');

1 row created.

SAM@OCM11G >insert into test_space values (3,' sam ');

1 row created.

SAM@OCM11G >commit;

Commit complete.

2.查询数据发现问题，并做字符统计

SAM@OCM11G >select * from test_space;

        ID NAME
---------- ----------
        1 sam
        2 sam
        3 sam

SAM@OCM11G >select id,length(name) from test_space;

        ID LENGTH(NAME)
---------- ------------
        1 3
        2 5
        3 8

3.使用trim去掉空格

SAM@OCM11G >select id,length(trim(name)) from test_space;

        ID LENGTH(TRIM(NAME))
---------- ------------------
        1 3
        2 3
        3 3

SAM@OCM11G >update test_space set name=trim(name);

3 rows updated.

SAM@OCM11G >select * from test_space;

        ID NAME
---------- ----------
        1 sam
        2 sam
        3 sam

4.检查（问题已处理）

SAM@OCM11G >select id,length(name) from test_space;

        ID LENGTH(NAME)
---------- ------------
        1 3
        2 3
        3 3

三、总结
    一个小小的trim函数，真是难者不会，会者不难。通过这个小案例，我又多掌握了ORACLE的一个小功能，学习脚步不能停。好久没有发文了，再给自己一针强心剂。加油 Sam！Where there is a will, there is a way.