Re: Novice needs help

On Tue, Mar 11, 2003 at 12:47:37PM -0500, Terry Lee Tucker wrote:
> I have loaded over 29,000 customer records into a database. I'm trying
> to apply a referential foreign key that validates the country code and
> the province code in another table. It won't work because somewhere in
> that 29,000 records there is a province code or country code that
> doesn't match. Is there a way to use a select statement to find out
> which customer records has the invalid data?
Yes.

Here is the partial table
> layout:
>
> cust province
> -------- -------
> country ===> country
> province ===> code
You didn't notice howw exactly your relation works. Is it:
cust.country=province.country and cust.province=province.code
?

If yes, try this:

select c.country,c.province
from cust c
left join province p on (c.country=p.country and c.province=p.code)
where p.country is null or p.code is null;

Regards,
Tomasz Myrta