What is Django aggregation and how can I use it?

What is Django aggregation and how can I use it?

Django aggregation is a feature that allows you to perform calculations on your data, such as sums, averages, and counts, directly in your database queries. You can use it with the annotate() and aggregate() methods.

Can you give me an example of how to use aggregation in a Django query?

Sure! For example, if you have a model called Order, you can calculate the total sales using:

from django.db.models import Sum

total_sales = Order.objects.aggregate(Sum('amount'))

What types of aggregation functions are available in Django?

Django provides several aggregation functions, including Count, Sum, Avg, Max, and Min. You can use these to perform various calculations on your querysets.

Are there any performance considerations when using aggregation?

Yes, using aggregation can be more efficient than fetching all records and calculating in Python, but be mindful of the size of your dataset and the complexity of your queries.