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Flattening Data: Need to eliminate rows, but keep join.

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Last Modified: 2012-05-12
Hi Techies--

I've flattened the data with the working SQL (in code block) so that the result set looks like:

SiteID      FacilityID

35              135;235;35


instead of:

SiteID      FacilityID

35              35
35              135
35              235

What I need to do next is dub 135 and 235 as 35, eliminating the other 2 rows retrieved so that I have:

SiteID      FacilityID

35      35


Any thoughts on how to achieve this?
SELECT s1.SiteID,
     STUFF((SELECT ';'+f.Number 
      FROM Facility f, [Site] s2
       WHERE s2.SiteID = f.SiteID
          and s2.SiteID = s1.SiteID
         ORDER by f.Number
          FOR XML PATH('')),1,1,'') AS [Number]
     FROM [Site] s1
   GROUP BY SiteID

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