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hi friends welcome to offer studies YouTube channel this is part 53 in pi spark playlist in this video we are going to discuss about aggregate functions so there are couple of aggregate functions which I want to cover in this video in our next video we cover few more aggregate functions so in this video the main focus will be to cover this average function approx count distinct function collect list collect set count distinct and count functions so firstly what is aggregate function and what they actually do so any aggregate function what it will actually do it will actually perform some kind of operation on group of rows and calculate some value and that calculated single value will be returned for that group acros so aggregate function will be take some group of rows and perform some calculation and that calculation value will be written as a single value so that is what most of the aggregate functions will do so as I said this video I will be covering all these functions here so let