Use aggregate functions over windows. Standard aggregates like SUM and AVG can be used with an OVER clause to calculate running totals and moving averages.
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:
MariaDB currently allows these aggregate functions to be used as window functions:
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SELECT COUNT(*) OVER (ORDER BY column) FROM table;