Re: many junction tables
От | Arne Weiner |
---|---|
Тема | Re: many junction tables |
Дата | |
Msg-id | 3B9500F5.E9F97B12@gmx.de обсуждение исходный текст |
Ответ на | many junction tables (Eric Kolve <ekolve@corp.classmates.com>) |
Список | pgsql-general |
I don't understand what exactly your problem is. What what makes me unsure is: why do you want to store the target table names in the association table? Eric Kolve wrote: > > I was wondering if anyone has a solution to the following problem. I > have a few tables similar to the following. > > person_table > > city_table > > company_table > > If I want to associate a person with a one or more cities. I need to > create a city_persons table that contains just the primary keys of both > the city_table and person_table. If I want to associate a person to > many companies, I have to do a similar thing. Now, if I wan to > generalize these associaes I can create something like an associate > table which will contain both id's plus two columns which indicate the > source and target tables of the relaionship. Does anyone have > suggestions along these lines on how to generalize such relationships? > > thanks, > > --eric > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly
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