folder_2 = sap_menu_area.objects.exclude(folder_2 = '').values('folder_2').distinct()
from myapp.models import Entry
from django.db.models import Q
Entry.objects.filter(~Q(id=3))
Using In and exclude values
Get the list of RFQ no's not in zrfq_no and delete.
zrfq_no = RFQ.objects.all().values('rfq_no').distinct()
zdel = RFQ_H.objects.exclude(rfq_no__in=zrfq_no)
zdel.delete()
obj = RFQ_H.objects.all()