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in this video we will talk about the Aggregate and annotate functions that can be used on query sets in order to retrieve some interesting information so for this example we will be using two helper applications within our Django project the first one is customers and if we take a look at the models py file of this application we will see a very simple class with two Fields the name and the age then if we move to the second application which is called purchases if we go to the models py file we will see another very simple class called purchase where there are two Fields amount and customer which is a foreign key to the customer class we saw just a few seconds ago so we will try to answer some questions so first of all what is the average customer age the second question is what is the total customer age so what is the total age of all our customers then we will take a look at the average age of our customers but only the ones that are older than 30 years then we will take a look at th
