SQL Query return results in a comma separated string (Optimised)?

You could dispense of the COALESCE altogether by just declaring @ListOfStuff as '', then handling the string concatenation and final return value slightly differently. As it stands you're evaluating it on every row.

COALESCE isn't really doing the work here (it just sorts out the nulls - see http://msdn.microsoft.com/en-us/library/ms190349.aspx).

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