From: | Paul M Foster <paulf(at)quillandmouse(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | What kind of JOIN, if any? |
Date: | 2009-09-17 14:29:11 |
Message-ID: | 20090917142911.GI28540@quillandmouse.com |
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Lists: | pgsql-general |
Folks:
I can't find a way to do this purely with SQL. Any help would be
appreciated.
Table 1: urls
id | url
--------------
1 | alfa
2 | bravo
3 | charlie
4 | delta
Table 2: access
userid | url_id
---------------
paulf | 1
paulf | 2
nancyf | 2
nancyf | 3
The access table is related to the url table via url_id = id.
Here's what I want as a result of a query: I want all the records of the
url table, one row for each record, plus the userid field that goes with
it, for a specified user (paulf), with NULLs as needed, like this:
userid | url
-------------
paulf | alfa
paulf | bravo
| charlie
| delta
I can do *part* of this with various JOINs, but the moment I specify
userid = 'paulf', I don't get the rows with NULLs.
Again, any help would be appreciated.
Paul
--
Paul M. Foster
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