From: | Ray O'Donnell <ray(at)rodonnell(dot)ie> |
---|---|
To: | Rich Shepard <rshepard(at)appl-ecosys(dot)com>, pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Re: Left join syntax error |
Date: | 2024-05-18 15:04:44 |
Message-ID: | 7c4b1acc-951b-473f-bdc3-c4ae7298f875@rodonnell.ie |
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Lists: | pgsql-general |
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(at)rodonnell(dot)ie
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