Django - get distinct dates from timestamp

Question

I\'m trying to filter users by date, but can\'t until I can find the first and last date of users in the db. While I can have my script filter out dups later on, I want to do it

Answer 1

When doing reports on larger datasets itertools.group_by might be too slow. In those cases I make postgres handle the grouping:

truncate_date = connection.ops.date_trunc_sql('day','timestamp')
qs = qs.extra({'date':truncate_date})
return qs.values('date').annotate(Sum('amount')).order_by('date')