Re: SQL command join question

From: "Phillip Smith" <phillips(at)weatherbeeta(dot)com(dot)au>
To: "'Ehab Galal'" <ehabgalal123(at)hotmail(dot)com>,<pgsql-sql(at)postgresql(dot)org>
Subject: Re: SQL command join question
Date: 2006-11-30 00:46:14
Message-ID: 009301c71418$f26e3d30$9b0014ac@wbaus090
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Would this be more appropriate...?
SELECT t1.*
FROM t1
OUTER JOIN t2 ON (t1.a=t2.a AND t1.b=t2.b)
OUTER JOIN t3 ON (t1.c=t3.c);

-----Original Message-----
From: pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org]
On Behalf Of Ehab Galal
Sent: Thursday, 30 November 2006 11:42
To: pgsql-sql(at)postgresql(dot)org
Subject: [SQL] SQL command join question

Hi,

I have three tables t1(a, b, c, d), t2(a, b, c, k), and t3(c, e). I need to
outer join them as shown below, but only have all tuples from t1 as output.
But the following syntax does not allow me to do so.

SELECT t1.*
FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on
(t1.c=t3.c);

I'm getting the following error message:
ERROR: invalid reference to FROM-clause entry for table "t1"
HINT: There is an entry for table "t1", but it cannot be referenced from
this part of the query.

I'll be grateful if someone may help me with this.

Thanks,
Ehab

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