On 20 Jun 2011, at 17:03, Tarlika Elisabeth Schmitz wrote:
> I have two tables, town and townalias, the latter containing alternative
> town names.
> I would like to ensure that a town name is unique per
> country-region across the two tables.
>
> Can I do this with a constraint ot do I need to implement the logic via
> trigger?
This is very similar to what was recently discussed in the topic "Constraint to ensure value does NOT exist in another
table?"in this list.
Alban Hertroys
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