Row number in a Sql query

This is a simple way to create row numbering in a sql query, but with bad performance

(SELECT COUNT(*) FROM YourTable T1 WHERE T1.RankOrder < T.RankOrder) AS Rank

Better use rank() or row_number() functions. http://support.microsoft.com/default.aspx/kb/186133

select rank() OVER (ORDER BY RankOrder) AS Rank FROM YourTable
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