Wednesday, April 15, 2009

Split Function in SQL Server

Sql Server does not (on my knowledge) have in-build Split function. Split function
in general on all platforms would have comma-separated string value to be split
into individual strings. In sql server, the main objective or necessary of the Split
function is to convert a comma-separated string value (‘abc,cde,fgh’) into a temp
table with each string as rows.

The below Split function is Table-valued function which would help us splitting
comma-separated (or any other delimiter value) string to individual string.

Create FUNCTION [dbo].[Split]
( 
 @String varchar(8000), @Delimiter char(1)
)
returns @temptable TABLE (items varchar(8000)) 
as 
begin 

declare @idx int 
declare @slice varchar(8000) 

select @idx = 1 

if len(@String)<1 or @String is null 
 return 

while @idx!= 0 
begin 
 
 set @idx = charindex(@Delimiter,@String)  
 if @idx!=0 
  set @slice =left(@String,@idx - 1) 
 else 
  set @slice = @String 

 if(len(@slice)>0) 
  insert into @temptable(Items)values(@slice) 

 set @String = right(@String,len(@String) - @idx) 
 if len(@String)= 0 
 break 
end 
return 
end 

--now fire this query 
select top 10 * from dbo.split('Chennai,Bangalore,Mumbai',',')

--this will return following results. 
-- Items -----------------------
--Chennai 
--Bangalore 
--Mumbai

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