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

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SQLite has nice feature which allows to register custom aggregate functions written in C (and Lua in case of Tarantool) and available from SQL like any other. Example is count_x () which counts number ...

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.