Re: Column order in multi column primary key

On Mon, Aug 8, 2016 at 3:06 PM, Craig Boucher <craig(at)wesvic(dot)com> wrote:

> Here is one of the tables that can have millions of rows and foreign key
> constraints to 5 other tables.
>
>
>
> CREATE TABLE public.work_session
>
> (
>
> work_session_id integer NOT NULL DEFAULT nextval('worksession_
> worksessionid_seq'::regclass),
>
> customer_id integer NOT NULL,
>
> store_id integer NOT NULL,
>
> department_id integer NOT NULL,
>
> station_id integer NOT NULL,
>
>
>

> CREATE TABLE public.department
>
> (
>
> department_id integer NOT NULL DEFAULT nextval('department_
> departmentid_seq'::regclass),
>
> customer_id integer NOT NULL,
>
>
>
No low-hanging fruit that I can see.

This is just some thought food - much
would depend on the usage patterns of the table and the exact relationship
between the different attributes. Specifically, you've modeled this as an
intersection of 4 orthogonal aspects (customer, store, department, station)
while in reality these items likely exist in a strict hierarchy. It would
​be ​
possible to have the only FK on work_session be (station_id, customer_id) -
and have station have the FK (department_id, customer_id) - and so forth.

David J.