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UDF to Add items to a comma delimited list (See related posts) 

/*
_A_dd to _C_omma delimited _L_ist - simplified version of AddToList
Adds an element (nvarchar) to the end of a comma delimited list (nvarchar)
*/
ALTER FUNCTION dbo.fnACL (@List nvarchar(4000), @New nvarchar(4000))
RETURNS nvarchar(4000)
AS  
BEGIN 
        --Treat ''s as NULLs
        SELECT @List = NULLIF(@List, ''), @New = NULLIF(@New, '')
        --first try returning the concatened string, if null then try just the list, if it too is null, just the new element
        RETURN COALESCE(@List + ',' + @New, @List, @New)
END
to sql udf by Q2Developers on Mon Oct 17 12:07:48 +0000 2005

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