如何从SQL Server中的列值替换特定的字符串

Question

I have varchar column in my table which has some data like: 我的表中有varchar列，其中包含一些数据，例如：

"#306 loream ipsum aaabbbqqqcc"
"#302 loream ipsum aaabbbceefec"
"#330 loream ipsum aaabbbccsds"

I want to replace #3XX like regex syntax in C# or JavaScript. 我想替换#3XX例如C＃或JavaScript中的regex语法。

How to implement this in SQL Server? 如何在SQL Server中实现呢？

Answer 1

You can make use of the STUFF function to achieve this. 您可以使用STUFF函数来实现此目的。

Declare @String Varchar(100) = '#306 loream ipsum aaabbbqqqcc'

SELECT STUFF(@String , 1,5,'')

Result: loream ipsum aaabbbqqqcc

You can make use of the RIGHT function to achieve this. 您可以使用RIGHT函数来实现此目的。

Declare @String Varchar(100) = '#306 loream ipsum aaabbbqqqcc'

SELECT RIGHT(@String , LEN(@String) - 5)

RESULT:  loream ipsum aaabbbqqqcc

Answer 2

You can use substring if it is always first 4 characters.. 如果子字符串始终是前4个字符，则可以使用。

declare @str varchar(max)
set 
@str='#306 loream ipsum aaabbbqqqcc'

select substring(@str,5,len(@str))

Answer 3

To Remove it , use this query.Since the length of the string which you want to remove is always 4. 要删除它，请使用此查询。由于要删除的字符串的长度始终为4。

     UPDATE table-name SET column-name = RIGHT(column-name, LEN(column-name) - 4)

But run only one time because it is UPDATE query 但是只运行一次，因为它是UPDATE查询

For MySql you have to use the length() function like that, 对于MySql，您必须使用length（）函数，

     UPDATE table-name SET column-name = RIGHT(column-name, LENGTH(column-name) - 4)

Answer 4

if it is possible to split string by space then follow below one 如果可以按空格分割字符串，则按照下面的一个

Declare @str Varchar(100) = '#306 loream ipsum aaabbbqqqcc'
set @str =substring( @str ,CHARINDEX(' ', @str) , len(@str) - CHARINDEX(' ', @str)+1)

In this one you don't need any default length or default replacement text. 在此代码中，您不需要任何默认长度或默认替换文本。