Can someone define what an aggregate function is?

Answer 1

aggregate function provides sum eg sum(salAry)

Answer 2

aggregate function includes all mathematical opration.

Answer 3

An aggregate function performs some kind of calculation with a bunch of entries (the result of your select), for example, adds up all the values in a column (SUM), gets the average (AVG), minimum (MIN) or maximum (MAX) value of all the values in a column, or returns the number of entries in your result set (COUNT).

Answer 4

aggregate function is used to perform operations like sum, avg, min,max :)