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

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 numb ...

If you have an aggregation function (sum, avg, count) in your select clause or if you have a group by clause, all of your columns must be aggregated or grouped.<BR><BR>In the version of SQL that I ...