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use off geometric types

From: dhoubrechts <dhoubrechts(at)cybernet(dot)be>
To: "pgsql-interfaces(at)postgresql(dot)org" <pgsql-interfaces(at)postgresql(dot)org>
Subject: use off geometric types
Date: 2003-02-27 21:00:02
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces
I create a db : createdb geo
I log into the db :  psql geo
I create a table named poly :
geo=# create table poly (parc varchar(15), graphic polygon);

I populate the table : 
insert into poly values('A52','(2,1),(1,3),(2,5),(4,6),(6,4),(5,2)');
insert into poly values('A135','(3,3),(7,4),(8,2),(4,1)');

Now I would look if the first polygon overlaps the second using the
varchars for retriving the poly.
I could do it so :
geo=# select '((2,1),(1,3),(2,5),(4,6),(6,4),(5,2))'::polygon &&
(1 row)
Now, how can I do to have something like :
geo=# select graphic::polygon  from poly where parc='A52' && select
graphic::polygon from poly where parc='A135';

Thanks for help


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Subject: Re: use off geometric types
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