Re: two table comparison: find a mismatch?

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