How can you determine if records exist in the database using the QuerySet method?

In Django, to check for the existence of records in the database through a QuerySet, you can use the exists() method. It returns True if at least one record satisfies the query conditions, and False otherwise.

Example:

from myapp.models import Product

# Check if there are products with a price greater than 100
if Product.objects.filter(price__gt=100).exists():
    print("There are products more expensive than 100")
else:
    print("No such products")

The exists() method is efficient because it performs a query using SQL SELECT EXISTS, which is faster than retrieving all records.