Question 115075 in PostgreSQL Question posted in
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Postgresql – Shared Postgres Relation Best Practices

What is the best practice to encode this relationship in a postgres database schema?

Given the following entities: Document, Profile, Message

And the following relationships:

One Profile to many Documents

One Message to many Documents

Essentially documents are a shared resource used by other entities. Should I use different Join Tables for each related entity? Is there some other way to set this up? It is possible in the future that other entities will reference Documents

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  1. Chosen as BEST ANSWER
    0

    For anyone who finds this post and wants an actual answer: The foreign key for the relation HAS to be on the many-to-one side of the relationship or there has to be a join table mapping the relation. You cannot store multiple foreign keys in a single column on the one-to-many side of the relationship.


  2. 0

    A one-to-many relationship is modeled with a foreign key, in this case in the documents table. If you need two such relationships, define two foreign keys.

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