From: | "Ross J(dot) Reedstrom" <reedstrm(at)rice(dot)edu> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: two table comparison: find a mismatch? |
Date: | 2000-07-28 21:44:37 |
Message-ID: | 20000728164437.B7028@rice.edu |
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Lists: | pgsql-sql |
On Fri, Jul 28, 2000 at 04:54:58PM -0400, Web Manager wrote:
> Hello,
>
> here is to table:
> Table "city"
> Attribute | Type | Modifier
> ----------------+-------------+---------------------------------------------
> city_id | smallint | not null default
> nextval('seq_city'::text)
> region_id | smallint |
> region_tour_id | smallint |
> country_id | smallint |
> name_fr | varchar(40) |
> name | varchar(40) |
> url_id | smallint |
>
>
> Table "region"
> Attribute | Type | Modifier
> -----------+-------------+----------------------------------------------
> region_id | smallint | not null default nextval('seq_region'::text)
> country_id| smallint |
> name_fr | varchar(40) |
> name | varchar(40) |
> address | boolean |
> url_id | smallint |
>
>
> I whant to fins a "hole" in the linkage... a region number in the city
> table is not in the region table any more.
>
> How can I do that?
>
SELECT * FROM city WHERE region_id NOT IN (SELECT region_id FROM region)
should do it.
BTW, the syntax on your defaults for the id's seems a bit odd. Any reason
your casting the text literal to text? Have we got a bug somewhere?
Ross
--
Ross J. Reedstrom, Ph.D., <reedstrm(at)rice(dot)edu>
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St., Houston, TX 77005
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