How to Create Split function in SQL Server

For using IN statement in SQL Server and search multiple values from string you can use

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  

Just lets see a simpel example of how to use the created split function.

DECLARE @INSTRING AS varchar(300)
SET @INSTRING = '1,2,5'
Select * from Split(@INSTRING,',')
SELECT      *
FROM TableA
Where id IN (Select * from Split(@INSTRING,','))