[Monetdb-developers] Fastest way to calculate median?

Hi - I have an int column with several million rows of data. What is the fastest way to write a query to get the median value of the column? Apparently there is no median() function in SQL. A web search revealed lots of various talk about using stored procedures and fancy functions. None of this looked like it would be very efficient. I searched these archives but didn't see a single mention of median. Thank you!