Re: SELF LEFT OUTER JOIN = SELF JOIN including NULL values

From: Raymond O'Donnell <rod(at)iol(dot)ie>
To: julia(dot)jacobson(at)arcor(dot)de
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: SELF LEFT OUTER JOIN = SELF JOIN including NULL values
Date: 2010-09-17 16:33:09
Message-ID: 4C939845.5030601@iol.ie
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On 17/09/2010 17:16, julia(dot)jacobson(at)arcor(dot)de wrote:
> Hello everybody out there using PostgreSQL,
>
> After having read the official documentation and having done
> extensive web search, I'm wondering how to perform something like a
> SELF LEFT OUTER JOIN in PostgreSQL, i.e. a SELF JOIN on a table
> containing NULL values in one of the columns to join.

Something like this? -

select....
from my_table a
left join my_table b on (a.my_column = b.my_column)
...

Would this do it?

Ray.

--
Raymond O'Donnell :: Galway :: Ireland
rod(at)iol(dot)ie

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