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问题描述
Django的开发版本具有聚合函数，如Avg，Count，Max，Min，StdDev，Sum和Variance（）。有没有理由中值从列表中缺少？
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?
实现一个似乎很容易。我错过了什么吗？总结功能在幕后执行多少？
Implementing one seems like it would be easy. Am I missing something? How much are the aggregate functions doing behind the scenes?
推荐答案
因为中位数不是SQL聚合。例如，参见和 MySQL聚合函数的列表。
Because median isn't a SQL aggregate. See, for example, the list of PostgreSQL aggregate functions and the list of MySQL aggregate functions.
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