use off geometric types - Mailing list pgsql-interfaces

From dhoubrechts
Subject use off geometric types
Date
Msg-id 3E5E7C52.2138702B@cybernet.be
Whole thread Raw
Responses Re: use off geometric types
List 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 &&
'((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';

Thanks for help
Didier.


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