Re: check constraint on multiple tables?

On Wed, Mar 03, 2010 at 07:14:29AM -0800, Richard Broersma wrote:
> On Wed, Mar 3, 2010 at 7:02 AM, Louis-David Mitterrand
> <vindex+lists-pgsql-sql@apartia.org> wrote:
> 
> 
> > What is the best solution? Adding an id_ship to 'cabin'? Or check'ing
> > with a join down to 'ship'? (if possible).
> 
> Can you post simplified table definitions for the relations involved?

Sure, here they are:

CREATE TABLE ship (   id_ship serial primary key,   ship_name text unique not null
);

CREATE TABLE cabin_type (   id_cabin_type serial primary key,   id_ship integer references ship,   cabin_type_name
text,  cabin_type_code text,unique(cabin_type_code, id_ship)
 
);

CREATE TABLE cabin_category (   id_cabin_category serial primary key,   id_cabin_type integer references cabin_type,
cabin_cat_nametext,   cabin_cat_code text,unique(cabin_cat_code, id_cabin_type)
 
);

CREATE TABLE cabin (   id_cabin serial primary key,   id_cabin_category integer references cabin_category,
cabin_numberinteger not null,unique(id_cabin_category, cabin_number)
 
);