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.

Ex: SELECT COUNT(*) FROM customers; counts the total number of customers. You can use aggregate functions in SQL queries to perform operations on a set of values and return a single calculated ...

Aggregate functions in SQL are used to perform calculations on a set of values and return a single result. These functions operate on a group of rows and produce a single value as output. Some common ...

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 ...

BR><BR>Is there a way to use aggregate functions and only group on specific keys, rather than every column? For instance, I have the following query a lot.<BR><BR>Select (lots of junk), Count ...

What is an SQL Window Function? A window is a set of rows or observations in a table or result set. In a table, you may have more than one window depending on how you specify the query.