From: | Steve Clark <sclark(at)netwolves(dot)com> |
---|---|
To: | Oliver Elphick <olly(at)lfix(dot)co(dot)uk>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: noobie join question |
Date: | 2015-05-11 13:06:43 |
Message-ID: | 5550A963.6040103@netwolves.com |
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Lists: | pgsql-general |
On 05/11/2015 07:16 AM, Oliver Elphick wrote:
> On Mon, 2015-05-11 at 06:46 -0400, Steve Clark wrote:
>> Hi List,
>> I am having trouble trying to figure out
>> how to get the result listed at the bottom.
>>
>> I have 3 tables units, types of units which has a description of the units,
>> and a table that list associations of the units. I can't figure out
>> how to do the proper joins. Any pointers would be appreciated.
> SELECT us.udevice, ts.descr, ud.udevice, td.descr
> FROM assoc AS a
> LEFT JOIN units AS us
> ON a.src_id = us.uid
> LEFT JOIN types AS ts
> ON us.utype = ts.id
> LEFT JOIN units AS ud
> ON a.dest_id = ud.uid
> LEFT JOIN types AS td
> ON ud.utype = td.id;
>
>
>
>
Thanks Oliver - that worked perfectly.
--
Stephen Clark
*NetWolves Managed Services, LLC.*
Director of Technology
Phone: 813-579-3200
Fax: 813-882-0209
Email: steve(dot)clark(at)netwolves(dot)com
http://www.netwolves.com
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