In database management, an aggregate function or aggregation function is a function where the values of multiple rows are grouped together to form a single summary value. In database management, an aggregate function or aggregation function is a function where the values of multiple rows are grouped together to form a single. In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria. An aggregate function is a mathematical computation involving a set of values that results in a single value expressing the significance of the data it is computed from. All aggregate functions by default exclude nulls values before working on the data. An aggregate function performs a calculation one or more values and returns a single value.

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