Home Database Mysql Tutorial 在SQL中获取一个长字符串中某个字符串出现次数的实现方法

在SQL中获取一个长字符串中某个字符串出现次数的实现方法

Jun 07, 2016 pm 04:17 PM
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以下是对在SQL中获取一个长字符串中某个字符串出现次数的实现方法进行了详细的分析介绍,需要的朋友可以参考下 在SQL中获取一个长字符串中某个字符串出现次数的实现方法 比如有个字符串: X-BGS-2010-09-15-001 我想知道其中'-'出现的次数,可以用下面的方法

以下是对在SQL中获取一个长字符串中某个字符串出现次数的实现方法进行了详细的分析介绍,需要的朋友可以参考下

 

在SQL中获取一个长字符串中某个字符串出现次数的实现方法

比如有个字符串:

X-BGS-2010-09-15-001

我想知道其中'-'出现的次数,,可以用下面的方法实现,而不需要复杂的一个个字符分析。

declare @a varchar(100)
set @a='X-BGS-2010-09-15-001'
select len(replace(@a,'-','--'))-len(@a)

通俗一点讲就是 如果要判断表a中的 字段b中存在几个字母c的话,可以这么写

select len(replace(b,'c','--'))-len(b) from a,当然这里面的函数len可能因为不同数据库而不同

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