Gary Stainburn wrote:
> Hi folks,
>
> I've got two tables, first a history table containing tallies for staff/jobs
> prior to going live, and second a roster table showing date, diagram, job
> with one record per person per job per day. the tables are:
>
> create table history (
> hsid int4 not null references staff(sid),
> hjid int4 not null references jobs(jid),
> hcount int4,
> primary key (hsid,hjid));
>
> create table roster (
> rodate date not null,
> rogid int4 not null references diagrams(gid),
> rojid int4 not null references jobs(jid),
> rosid int4 references staff(sid),
> primary key (rodate, rogid, rojid));
>
> What's the best/quickest/cheapest way to create a view in the format of the
> history table but including the details from the roster table for all records
> prior to today.
>
> I've been looking at some form of sub-select/join scheme but as some will only
> exist on the history and some will only exist on the roster while many will
> exist on both.
Hello again.
What if they exists in both tables - you need only one row result?
If yes, you should use FULL OUTER JOIN and COALESCE.
selectcoalesce(hjid,rjid) as jid,coalesce(hsid,rsid) as sid,hcount,rodate,rogid
fromhistoryfull outer join roster on (hjid=rjid and hsid=rosid)
Using other names for the same field in other tables comes again -
If you have the same name for jid and sid, you wouldn't need coalesce.
Regards,
Tomasz Myrta
