Learn what aggregate functions are, how to use them in SQL queries, and why they are useful for BI. Find examples of common scenarios and calculations.

For example, these functions generate statistical reports, perform financial analysis, and manage inventory levels. In addition, we can better understand the data we are working with by using ...

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 ...

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