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Get a string only from another string in the sql server

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[数据库(mssql) 所属分类 数据库(mssql) | 发布者 店小二03 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

I am looking for solution to get a character based string extracted from another string. I need only first 4 "characters only" from another string. The restriction here is that "another" string may contain spaces, special characters, numbers etc and may be less than 4 characters.

For example - I should get

"NAGP" if source string is "Nagpur District"

"ILLF" if source string is "Ill Fated"

"RAJU" if source string is "RA123 *JU23"

"MAC" if source string is "MAC"

Any help is greatly appreciated.

Thanks for sharing your time and wisdom.

You can use the answer in the question and add substring method to get your value of desired length How to strip all non-alphabetic characters from string in SQL Server?

i.e.

Create Function [dbo].[RemoveNonAlphaCharacters](@Temp VarChar(1000)) Returns VarChar(1000) AS Begin Declare @KeepValues as varchar(50) Set @KeepValues = '%[^a-z]%' While PatIndex(@KeepValues, @Temp) > 0 Set @Temp = Stuff(@Temp, PatIndex(@KeepValues, @Temp), 1, '') Return @Temp End

use it like

Select SUBSTRING(dbo.RemoveNonAlphaCharacters('abc1234def5678ghi90jkl'), 1, 4);

Here SUBSTRING is used to get string of length 4 from the returned value.

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