On 18/05/2024 16:01, Rich Shepard wrote:
> On Sat, 18 May 2024, Ray O'Donnell wrote:
>
>> You need to include the alias for the table also - see "...from
>> companies as c..." in Shammat's example.
>
> Ray,
>
> That didn't work:
> bustrac-# FROM people as p, companies as c
> bustrac-# LEFT JOIN companies as c ON c.company_nbr = p.company_nbr;
> ERROR: table name "c" specified more than once
>
> so I tried only the alias on the join line:
> bustrac-# LEFT JOIN c ON c.company_nbr = p.company_nbr;
> ERROR: relation "c" does not exist
> LINE 3: LEFT JOIN c ON c.company_nbr = p.company_nbr;
> ^
> and that didn't work either.
Hi Rich,
Look again at Shammat's example! -
SELECT p.lname, p.fname, p.job_title, p.company_nbr, p.email,
c.company_name
FROM people as p
LEFT JOIN companies as c ON c.company_nbr = p.company_nbr
NB - "... from people as p left join companies as c on ...." - i.e. the
companies table (or its alias c) is only specified once.
HTH,
Ray.
>
> Thanks,
>
> Rich
>
>
--
Raymond O'Donnell // Galway // Ireland
ray@rodonnell.ie