SQL Server 2008 przy użyciu RANK do dynamicznego numerowania wierszy

To powinno wystarczyć:

SELECT rank() OVER (ORDER BY WL.LastName, WL.FirstName) as rank, WL.LastName, WL.FirstName 
FROM  @tblWaitList WL         
INNER JOIN @tblSeminar S 
ON WL.SeminarGuid=S.SeminarGuid     
WHERE S.SeminarID = @SeminarID AND S.SeminarType = @SeminarType         
ORDER BY rank ;