Re: xref table - design consideration

You can keep them in sync with 3 triggers, instead of one. Actually, I don't even know how would you keep 4 tables in sync with only a single trigger.

On 11/24/2003 12:44:25 PM, Barbara Baker wrote:
> List:
> We're trying to design a CRM app. We believe we need
> 3 tables (Prospect/Customer, Private Party, and
> Agency) because those 3 kinds of (potential) customers
> have different attributes.
>
> The sales rep should know whether they're looking up
> cust, private party, or agency. But what if they
> don't? (They're sales, after all. What if the have a
> hangover?) For performance reasons, we'd prefer not
> to join all 3 tables for a lookup.
>
> I was thinking about 1 cross-reference table with the
> primary key from each of the 3 tables stored in one
> cross-ref table. Any way to keep such a table updated
> other than with a trigger?
>
> Any other ideas about how to do a quick lookup without
> 1 big join?
>
> In case you can't tell, db design is NOT my forte.
> Thanks for any ideas!
>
> Barb
>
>
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Mladen Gogala
Oracle DBA

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