Example 2: Using Case() expressions Case() expressions are used to create conditional expressions in SQL queries. They can be used to perform different operations based on some conditions.python
Example 3: Using Func() expressions Func() expressions are used to create custom SQL functions in queries. They can be used to perform complex operations on fields or values.python from django.db.models import Func from myapp.models import MyModel # Create a custom SQL function to calculate the square of a value class Square(Func): function = 'POWER' template = '%(function)s(%(expressions)s, 2)' # Get all records where the square of field1 is equal to 16 MyModel.objects.filter(Square('field1') == 16) ``` In conclusion, django.db.models.expressions is a package library in Django that provides classes and functions for creating SQL expressions in queries. It is used to perform operations on fields or combine different fields or values.