[postgis-users] Restrict values entered in a shapefile in postgis/postgres

Sandro Santilli strk at keybit.net
Thu Apr 19 03:34:00 PDT 2012

On Thu, Apr 19, 2012 at 03:40:48PM +0530, MaheshKrishnan wrote:

> So the problem is I want to restrict the values that can be entered in a
> specific column of a specific shape file but haven't been able to do it.

You mean ".. of a specific table", not "shape file".

> For example if there is a shapefile called Hydro_points and it has an
> attribute column call Hydro_type I want only the values 1, 2 or 3 to be
> entered here.
> That table should not accept any other values

You can use CHECK constraints on the table, with something like:

 ALTER TABLE mytable ADD CONSTRAINT only_one_two_three
   CHECK "Hydro_type" IN (1,2,3);

(check the PostgreSQL reference manual to tweak and lear more)


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