public inbox for [email protected]  

help / color / mirror / Atom feed

From: Achilleus Mantzios <[email protected]>
To: Erik Thiele <[email protected]>
Cc: [email protected]
Subject: Re: special integrity constraints
Date: Mon, 22 Mar 2004 12:13:29 +0200 (EET)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

O kyrios Erik Thiele egrapse stis Mar 22, 2004 :

Did you check out the DEFERRABLE option on the constraint?

> hi,
> 
> i have two tables
> 
> create table a (x integer);
> create table b (y real);
> 
> i have the special constraint that the sum of the number of rows in
> table a plus the number of rows in table b must be even.
> 
> so there is a posibility of adding one element to a and one element to
> b, and again the constraint is met.
> 
> but this of course does not work, since between adding the element to a
> and adding the element to b, the constraint is not met.
> 
> so i cannot use a trigger.
> 
> what i need is the execution of a check procedure at commit time. is
> that somehow possible?
> 
> my database has much more tables than just a and b, and most time the other
> tables are modified and not a or b, so it would be nice to execute the
> constraint checking procedure only if a or b was modified.
> 
> yes :) this question i asked in my former mail too, but I think it
> looked like there was a workaround and my problem was wrong. so i
> created this new kind of problem here to make things clearer.
> 
> 
> cu
> Erik
> 
> 
> 

-- 
-Achilleus

view thread (13+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: special integrity constraints
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox