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one-to-one associations - need help

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hexbinary

Post subject: one-to-one associations - need help

Posted: Mon Sep 12, 2005 3:39 pm

Newbie

Joined: Mon Sep 12, 2005 3:36 pm
Posts: 5

Hi,

I would like to map a one to one association between the Tickler and Demographic table

tickler
--------
tickler_no PK
demographic_no
....

demographic
---------------
demographic_no

All the examples i found don't allow you to use the (demographic_no) as the column which maps the relation as apposed to the PK.

I've only been able to map this relation as a one to many set which isn't exactly what i want.

thanks

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cbredesen

Post subject:

Posted: Mon Sep 12, 2005 8:26 pm

Red Hat Associate

Joined: Mon Aug 16, 2004 11:14 am
Posts: 253
Location: Raleigh, NC

You need to use a many-to-one. Even if a demographic is used for only one tickler, the relational semantics are many-to-one, not one-to-one. This confuses many people in the beginning (myself included).

Don't forget to rate.

-Chris

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