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Pastable version of Nested select; is there a better way?

<pre class='prettyprint' language='ruby'>RankHistory.find_by_sql('select * from rank_histories rh where created_at = (select max(created_at) from rank_histories nstd where nstd.url = rh.url)')</pre> <a href="http://www.refactormycode.com/codes/664-nested-select-is-there-a-better-way" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>