theres line of code in tutorial:
Poll.objects.all().order_by('-pub_date')[:5]
this gives 5 Poll objects. I wonder if this is efficient way of
getting them? Does django get all rows first and then sort it and then
slice it to get only 5? Or is it optimized somehow. The question is if
its simplified for the tutorial and inefficient or this is the right
way to do it?
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