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sqldistinctfor-xml-path

How to SELECT DISTINCT with an ORDER BY and FOR XML in SQL Server 2008+

So I have been fighting with this for a while now and I thought this had to be a simple task. My goal is to return a single string of all the unique rows returned separated with a forward slash and ordered by the time they were entered. Here is example data

Table: Locations

Location   Time
========   =======
OR1        2013-02-06 16:55:47.000
OR1        2013-02-06 16:56:34.000
ICU1       2013-02-06 16:59:50.000
OR1        2013-02-06 17:02:50.000
ICU1       2013-02-06 17:09:50.000

So given the above table of data I want to return a string that says this "OR1/ICU1". I can return the distinct values as a string using FOR XML PATH but as soon as I throw in the ORDER BY it all falls apart with errors.

Ideas?

Solution

  • Try that;

    SELECT STUFF ((
  SELECT cast('/' as Varchar(max)) + Location
     From Locations
     Group by Location
     Order by MAX(Time) FOR XML PATH('')) , 1 , 1 , '' ) as result