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Re: issue about information_schema REFERENTIAL_CONSTRAINTS

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Fabien COELHO <fabien(dot)coelho(at)ensmp(dot)fr>
Cc: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, PostgreSQL Bugs List <pgsql-bugs(at)postgresql(dot)org>
Subject: Re: issue about information_schema REFERENTIAL_CONSTRAINTS
Date: 2011-02-19 23:22:11
Message-ID: 201102192322.p1JNMBx26553@momjian.us (view raw or flat)
Thread:
Lists: pgsql-bugspgsql-docs
Fabien COELHO wrote:
> 
> > If you're going to use something which is PostgreSQL-specific, you may 
> > as well write your own views or use the "native" tables and views 
> > directly.
> 
> I wish I could write portable code, if possible:-)
> 
> I'm basically writing views on top of the information_schema under the 
> assumption that what is expected to be a key is a key. The information 
> schema is *useless* otherwise as wrong tuples are built on join, and 
> derived information is not reliable.
> 
> I guess I must the only actual user of the information_schema, and it will 
> soon be back to zero user, which will be fine from the developers point of 
> view.

Based on this report and later discussion, I have applied the attached
documentation patch to warn users about the Postgres behavior of
information_schema.referential_constraints.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

Attachment: /rtmp/constraint.diff
Description: text/x-diff (891 bytes)

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