Articles tagged

17 December 2013
17 December 2013

Calculating the Median Value within a Partitioned Set Using T-SQL

It is ironic that one of the most essential of statistical aggregations, the median, has been so difficult in the past to calculate efficiently in SQL. Although the recent window functions provide the solution, there isn't an obviously superior algorithm performance-wise, particularly when working across partitioned sets. Dwain Camps sets the candidates to work and identifies the winners and losers.… Read more