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

From: Kevin Toepke <ktoepke_at_rlcarriers.com>
Date: Thu, 06 Nov 2003 08:54:25 -0800
Message-ID: <F001.005D5D82.20031106085425@fatcity.com>

Yes. There is a better way to model that.

Oh, you wanted a suggestion. How about including a LOADS table that has (at least) 3 colums

	truck_id
	cargo_id
	active_flag

That way when cargo is moved to a different truck you add a new record to the LOADS table and update the old one (setting the active_flag to false)

Kevin

-----Original Message-----
Sent: Thursday, November 06, 2003 9:45 AM To: Multiple recipients of list ORACLE-L

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
--

Author: <ryan_oracle_at_cox.net
INET: ryan_oracle_at_cox.net

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------

To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Kevin Toepke
INET: ktoepke_at_rlcarriers.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------