Oracle-L: Re: datamodelling question: updating foreign keys

From: AK <oramagic_at_hotmail.com>
Date: Thu, 06 Nov 2003 09:19:26 -0800
Message-ID: <F001.005D5D87.20031106091926@fatcity.com>

Well ,

How about cargo as table with primary key say cargo_id which unqiely identifies cargo and weight . Now you should have a cargo detail table that will have cargo_id , load , truck_id .

Cargo

cargo_id
total_load
date
blah
blah

cargo_detail

cargo_id
truck_id
load
date_delivered
blah
blah
from
to

This takes care of split cargo ( consigment ) .

-Ak

Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, November 06, 2003 6:44 AM

> I remember seeing this question asked on another forum some time back. I
dont like the solution the guy had and Im wondering how some of you might solve problem. Im giving a low level generic example.
>
> Lets say you have a parent-child relationship. The parent table is
'TRUCKS' and the child table is 'CARGO'. The foreign key to CARGO tells which truck the cargo is loaded on. When the cargo is moved to another truck, the foreign key is updated.
>
> I dont like this approach. it causes contention. what is a better way to
design this?
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
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> Author: <ryan_oracle_at_cox.net
> INET: ryan_oracle_at_cox.net
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: AK
  INET: oramagic_at_hotmail.com

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Received on Thu Nov 06 2003 - 11:19:26 CST