Get very last object of database

Hello guys, 

My issue is pretty simple. I want to get the very last record of my database (which is populated with thousands of entries)

So far ->very easy. But I want to make sure that the access to the database is as light as possible. Don't want django to parse everything in my database.

Kindly note that my DB has Primary key field.

I tried 

Mydb.objects.all()[:1]

Mydb.objects.all()[1:]

but both return the first filed instead of the last one.

Thanks for your help

Stephane

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