SELEZIONA articoli correlati in base alle parole chiave da una singola tabella

Alter FUNCTION [dbo].[uf_SplitKeywords] 
   (  @DELIMITER VARCHAR(5), 
      @LIST      VARCHAR(MAX) 
   ) 
   RETURNS @TABLEOFVALUES TABLE 
      (  ROWID   int IDENTITY(1,1), 
         [VALUE] VARCHAR(MAX) 
      ) 
AS 
   BEGIN
   Declare @Pos int
   While LEN(@List) > 0
      begin
        Select @Pos=CHARINDEX(@Delimiter,@List,1)      
        if @Pos>0
           begin
             Insert into @TABLEOFVALUES ([Value]) Values (SubString(@List,1,@Pos -1))
             Select @LIST = STUFF(@List,1,@Pos ,'')
           end
        else  
            begin
            Insert into @TABLEOFVALUES ([Value]) Values (@List)
            Select @LIST =''
            end  
      end
   Return 
   End

Con chiamata di

Select Distinct b.ArticleID,b.Title,b.Description,b.Details,b.KeyWords from
(
Select * from Article a1 
CROSS APPLY [dbo].[uf_SplitKeywords](',',keywords) f1
Where a1.ArticleID=3
) a
Join
(
Select * from Article a2 
CROSS APPLY [dbo].[uf_SplitKeywords](',',keywords) f2
) b
on a.Value=b.Value