Re: Left joins with multiple tables

Hi Colin,

Try

select id, name, a.field1, b.field2, c.field3
from
people p left outer join a on (a.person_id = p id)
left outer join b on (b.person_id = p.id)
left outer join c on (c.person_id = p.id);

HTH

Denis

----- Original Message -----
From: "Colin Fox" <cfox(at)cfconsulting(dot)ca>
To: <pgsql-sql(at)postgresql(dot)org>
Sent: Saturday, January 17, 2004 8:00 AM
Subject: [SQL] Left joins with multiple tables

> Hi, all.
>
> I've got a bit of a problem here. I have 4 tables - people, a, b, c (not
> the original names).
>
> For each person in the people table, they may or may not have a record in
> a, may or may not have a record in b, and may or may not have a record in
> c.
>
> Handling the first table (a) is easy:
>
> select id, name
> from people p left outer join a on a.person_id = p id;
>
> But I'd like to be able to do something like:
>
> select
> id, name, a.field1, b.field2, c.field3
> from
> people p left outer join a on a.person_id = p id,
> people p left outer join b on b.person_id = p.id,
> people p left outer join c on c.person_id = p.id;
>
> Naturally you can't repeat the 'people p' clause 3 times, but is there
> some other syntax that would let me do this?
>
> Thanks!
> cf
>
>
>
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