Aggregate functions as Window Functions.
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It is possible to use aggregate function as window function. When aggregate function is used as window function, it must have the OVER clause. For example, here's COUNT() used as window function:
select COUNT(*) over (order by column) from table;
MariaDB currently allows to use these aggregate functions as window functions: COUNT, SUM, AVG, BIT_OR, BIT_AND, BIT_XOR.
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