Both patterns will produce same query. You can also use 
django-debug-toolbar, which gives ur debugsqlshell tool. So you can execute 
code from the commandline and can see what the query will be.

Django also has a code pattern for your case - for getting the first 
element, you can just use latest() 
https://docs.djangoproject.com/en/dev/ref/models/querysets/#latest
i.e. Model.objects.latest()

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