It is about temporality of a record. Suppose I have a price table for each material:
Material Price Valid to --------------------------------------------- material-1 $12.50 2006-01-01 material-1 $12:52 2006-05-03 material-1 $13:59 2999-12-31 material-2 $54.32 2999-12-31 . . . For material-1 I know that the price $13.59 is valid from 2006-05-04 to the infinite, until a new price is established for this material. Thanks again!! If a record has the field date/time="2999-12-31 23:59:59" it means it is in effect, but if it contains "2006-08-10 10.00:01", for example, it is an expired record however I must keep it for historical reasons. For example --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~----------~----~----~----~------~----~------~--~---
