Have a table SHIPMENTS. When a CARGO moves to another TRUCK it becomes a
new SHIPMENT. SHIPMENTS has foreign keys to TRUCKS and CARGOES.
<ryan_oracle
@cox.net> To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
ml-errors Subject: datamodelling question:
updating foreign keys
11/06/2003 09:44
AM
Please respond
to 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?
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