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The Development version of Django has aggregate functions like Avg, Count, Max, Min, StdDev, Sum, and Variance (link text). Is there a reason Median is missing from the list?
Implementing one seems like it would be easy. Am I missing something? How much are the aggregate functions doing behind the scenes?
Because median isn’t a SQL aggregate. See, for example, the list of PostgreSQL aggregate functions and the list of MySQL aggregate functions.