Depending on how often you will be running this query you might consider using sp_executesql instead of the more generic exec. It will cache your execution plan and more importantly it allows for parameters.
http://www.sqlskills.com/blogs/kimberly/exec-and-sp_executesql-how-are-they-different/[/url]
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Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/