Oracle, SQL Server, Postgres, DB2 - the list goes on.<BR><BR>The reality is you have to restructure your query. A CTE isn't necessary, but will likely make the query more readable.

Anyone know the best way to write a median aggregate function in ms sql server 2k? I've seen a couple ways of doing it when I briefly searched google but they weren't presented as functions.

SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.