-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 hi jerryji,
this database is not normalized. you may consider switching to: things(thingid INTEGER, thing_weight etc.) and things_translations(thingid INTEGER, thing_name VARCHAR, language CHAR(5)) jerryji wrote: > Dear Kind Soul, > > I am stuck with the following database referential integrity > constraint problem. > > I have two tables: > things(thingid INTEGER, thing_name VARCHAR, language CHAR(5)) > and > thing_relations(thingid INTEGER, thing_parentid INTEGER) > > things hosts items in different languages, e.g.: > things(1, 'car', 'en_US'); things(1, 'voiture', 'fr_FR'); > things(2, 'engine', 'en_US'); things(2, 'moteur', 'fr_FR'); > things(3, 'brake', 'en_US'); things(3, 'freins', 'fr_FR'); > > while thing_relations describes the "consists of" relationship between > things, e.g.: > thing_relations(2, 1); > thing_relations(3, 1) > as engine and brake are parts of a car > > but since things(thingid) is not unique hence it can't be the primary > key in "things" and can't be the foreign key in "thing_relations", how > can the referential integrity constraints between > thing_relations(thingid) and things(thingid) be described? Or my > design is not making sense? > > Many thanks in advance. > > Jerry > > > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQCVAwUBR2TRNNpwN1sq38njAQLJPgP/diPRHpnH7s/auHx/LTXF5Y2Hx7npdLc/ yLuhvjx6Qatm4eU8sASFLLcTEYv1EZsOMRNVaxBEq7Aq89DeSPGVjIl7iy4egjKv rKIyCA4W5nhB37vFbdjMpd1fOmLiUqdtm/ObvSBxb6x3Hd3JDXYwcr86ve5j0XtT hlMT5X2uG4g= =WTdr -----END PGP SIGNATURE----- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
