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oracle replace()函数用法

Jun 07, 2016 pm 05:46 PM
replace() String replacement

在oracle数据库中我们要替换字符串会用到replace函数,下面来我给大家详细介绍oracle中replace()使用方法,有需要了解的朋友可参考。

在oracle数据库中我们要替换字符串会用到replace函数,下面来我给大家详细介绍oracle中replace()使用方法,有需要了解的朋友可参考。

用法介绍

REPLACE(char, search_string [, replacement_string ]    )

char : 等待替换的字符串

search_string : 搜索需要替换的字符串

replacement_string : 替换字符串

如果replacement_string缺省或者为null,那么所有char中出现的search_string 都将被移除

如果search_string为null,那么结果就是char

 代码如下 复制代码

SELECT REPLACE('JACK and JUE','J','BL') "Changes"   FROM DUAL;

例1

把中‘2011-10-11’ 的格式,结果导入的数据为 ‘2011/10/11’

 代码如下 复制代码

update 表1 t set t.列1=replace(( 列1from 表1 a where a.主键列=t.主键列) , '/' , '-' )  解决了我们问题。

 replace 字符串级别的代替

如:

 代码如下 复制代码
SELECT REPLACE('accd','cd','ef') from dual; --> aefd

 translate 字符级别的代替

如:

 代码如下 复制代码
select translate('acdd','cd','ef') from dual; -->aeff

 

分别详解

replace:

语法:REPLACE(char,search_string[,replacement_string])

解释:replace中,每个search_string都被replacement_string所代替

 代码如下 复制代码

select replace('acdd','cd','ef') from dual; --> aefd

 如果replacement_string为空或为null,那么所有的search_string都被移除

 代码如下 复制代码

select replace('acdd','cd','') from dual; --> ad

 如果search_string 为null,那么就返回原来的char

 代码如下 复制代码

select replace('acdd','ef') from dual; -->acdd

elect replace('acdd','','') from dual; -->acdd

(也是两者都为空的情况)

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