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 ...

To support aggregate window functions, the following two problems need to be addressed: How to make existing aggregate functions work as window function; How to handle duplicate sort key (field values ...

Aggregate window functions are used to perform operations on sets of rows in a window(s). They include SUM() , MAX() , COUNT() , and others. Rank window functions are used to rank rows in a window(s).