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Aggregate Functions as Window Functions

MariaDB starting with 10.2

Window functions were first introduced in MariaDB 10.2.0.

It is possible to use aggregate functions as window functions. An aggregate function used as a window function must have the OVER clause. For example, here's COUNT() used as a window function:

select COUNT(*) over  (order by column) from table;

MariaDB currently allows these aggregate functions to be used as window functions:

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https://mariadb.com/kb/en/aggregate-functions-as-window-functions/