From: Victor Yegorov <viy@pirmabanka.lv>
To: pgsql-sql@postgresql.org
Subject: Re: use of geometric types in select ?
Date: Sat, 1 Mar 2003 10:37:30 +0200
Message-ID: <20030301083730.GA9377@pirmabanka.lv> (raw)
In-Reply-To: <3E5E7E29.58D19347@cybernet.be>
References: <3E5E7E29.58D19347@cybernet.be>
* dhoubrechts <dhoubrechts@cybernet.be> [01.03.2003 03:32]:
> 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 &&
> '((3,3),(7,4),(8,2),(4,1))'::polygon;
> ?column?
> ----------
> t
> (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';
Something like this:
select (g1.graphic && g2.graphic) from poly g1, poly g2
where g1.parc = 'A52' and g2.parc = 'A135';
--
Victor Yegorov
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To: pgsql-sql@postgresql.org
Cc: viy@pirmabanka.lv
Subject: Re: use of geometric types in select ?
In-Reply-To: <20030301083730.GA9377@pirmabanka.lv>
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