queryset minimization

Hi all,

Is there any shortcut (minimum db hit) for the following querysets:

p = Person.objects.get(mail="person1@ex.com")

p.password & form.password comparison and it is ok.

#reversing to the person's groupregisteration, for example:

reg = p.groupregistration_set.all() #groupregistratin model is simply person (foreign key) and group (foreign key)

#evaluating group of reg list.

g = reg.group (for the every member of reg list)

#and finally group name

n = g.name (for the every member of g list)

Which queryset or querysets hits the db, and how can I minimize it.

Thanks.

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