aggregate function

In computer science, an aggregate function is a function that computes a single result value from a collection of input values such as a set, a bag or a list.Common aggregate functions include:Average()Count()Maximum()Minimum()Sum()Aggregate functions are common in numerous programming languages such as Ruby, SQL, and in relational algebra.
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کامپيوتر : عمل جمعى
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aggregate 
 function 

A functions that performs a calculation on a column in a set of rows and returns a single value.

aggregate function

A function, such as Sum, Count, Avg, and Var, that you can use to calculate totals. In writing expressions and in programming, you can use SQL aggregate functions (including the four listed here) and domain aggregate functions to determine various statistics.