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08.10.2006 at 02:11PM PDT, ID: 21950573
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9.0

Database Modeling  - Ensuring uniqueness across tables

Asked by lcor in Databases Miscellaneous

Here's an interesting problem.

I have a product table with another table that holds previous product info

Product table            Previous Product Table
--------------             -------------------------
p_id  (PK)                 prev_id (PK)
p_name                   prev_name
                               p_id (FK)

How do I ensure that prev_name doesn't match any of the p_names in the other table...I know this is what FK and PKs ar e for so to write a trigger that checks Product table to me seems against data modeling principles.

Keep in mind that there a given p)name there could be multiple prev_names.

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[+][-]08.10.2006 at 02:14PM PDT, ID: 17291400

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[+][-]08.10.2006 at 02:25PM PDT, ID: 17291508

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[+][-]08.10.2006 at 03:06PM PDT, ID: 17292070

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[+][-]08.10.2006 at 09:20PM PDT, ID: 17293588

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About this solution

Zone: Databases Miscellaneous
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Solution Provided By: MohanKNair
Participating Experts: 1
Solution Grade: A
 
 
 
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