From: Slawek Jarosz <Jarosz.S@ems-t.ca>
To: pgsql-sql@postgresql.org
Subject: Optional join
Date: Thu, 14 Aug 2003 10:40:02 -0400
Message-ID: <sf3b6707.030@ems-t.ca> (raw)
Hi,
I trying to write a query that will join 2 tables. Here's the concept:
Table 1: table1, primary key pk1
Table 2: table2, primary key pk2
One of the fields (f2) in table2 contains either the primary key of table1 or a NULL value. So normally a pretty basic query:
SELECT table1.*, table2.pk2 FROM table1, table2 WHERE table2.f2 = table1.pk1;
BUT what I would like to do is show all records of Table 1 even if there is no match in Table 2. Meaning that the reults could be
table1... table2.pk2
table1... NULL
Doable?
Thanks.
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To: pgsql-sql@postgresql.org
Cc: Jarosz.S@ems-t.ca
Subject: Re: Optional join
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