Seems to me that the proper solution is to create a new record, and use
a status indicator to determine where the cargo is currently.
Updating the FK causes you to lose any history of where the cargo has been.
ie. no cargo tracking possible.
This is my off the cuff, didn't spend a great deal of time on it, hope it works
for you, answer.
As you said though, the current process is highly suspect.
Jared
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Sent by: [EMAIL PROTECTED] 11/06/2003 06:44 AM
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To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> cc: Subject: datamodelling question: updating foreign keys |
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?
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