check (constraint) on point data type?

От: Jill
Тема: check (constraint) on point data type?
Дата: ,
Msg-id: BAY102-DAV5F941AFBDF619F5CAF73DFFF00@phx.gbl
(см: обсуждение, исходный текст)
Ответы: Re: check (constraint) on point data type?  ("Jim Adams")
Re: check (constraint) on point data type?  (Michael Glaesemann)
Список: pgsql-novice

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check (constraint) on point data type?  ("Jill", )
 Re: check (constraint) on point data type?  ("Jim Adams", )
 Re: check (constraint) on point data type?  (Michael Glaesemann, )
  Re: check (constraint) on point data type?  (Jim Nasby, )
   Re: check (constraint) on point data type?  (Michael Glaesemann, )
 Re: check (constraint) on point data type?  ("Jill", )
  Re: check (constraint) on point data type?  (Michael Glaesemann, )

Hi,
I'd like to limit the values that can be added to a field.
The field is of type 'point', and I'd like it to reject any values less than 0 or bigger than 1 (i.e., accept only points with values like (0.4, 0.26)).
Let's say I try to define the upper boundary by doing:
ALTER TABLE "public"."locations"  ADD CONSTRAINT "up_boundary_chk" CHECK (location < (1,1));
 
but it fails.
What am I doing wrong?
I'm using Postgres 8.2.4.1
Thanks!
Jill
 

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