Re: weak entities
From: Heinz Huber <Heinz.Huber_at_elbanet.co.at>
Date: 2000/02/28
Message-ID: <38BA1D4D.25CBE4EA_at_elbanet.co.at>#1/1
Date: 2000/02/28
Message-ID: <38BA1D4D.25CBE4EA_at_elbanet.co.at>#1/1
Hi!
Fernando wrote:
>
> Hi!
>
> Could someone please explain me what these are and give an
> example? O:-)
IIRC, weak entities are entities whose depends on other entities (includes a foreign key). Modelling as tables you have the following:
TABLE Master (
MKey,
Data....);
Primary Key (MKey)
TABLE Detail (
MKey,
DKey,
Data....);
Primary Key (MKey, DKey)
Foreign Key (MKey, Master.MKey)
Heinz Received on Mon Feb 28 2000 - 00:00:00 CET