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UDF to add a sql_variant to a list (See related posts) 

--Adds a sql_variant element to the end of a sql_variant list, after first inserting a delimiter (nvarchar)
--If both element and list are nvarchars, using dbo.fnAddToList will be faster
ALTER FUNCTION dbo.fnAddVarToList (@VarList sql_variant, @VarNew sql_variant, @Del nvarchar(10))
RETURNS nvarchar(4000)
AS  
BEGIN 
        DECLARE @List nvarchar(4000), @New nvarchar(4000)
        SELECT @List = NULLIF(CONVERT(nvarchar(4000), @VarList), ''), 
                @New = NULLIF(CONVERT(nvarchar(4000), @VarNew), '')
        --First try the concatened string, if null then just the list, 
        --if it too is null, just the new element
        RETURN COALESCE(@List + @Del + @New, @List, @New)
END
to sql udf by Q2Developers on Mon Oct 17 12:11:15 +0000 2005

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