From: Martijn Tonies
Date: November 20 2003 2:45pm
Subject: Re: [SOLVED]Re: LEFT JOIN problem
List-Archive: http://lists.mysql.com/mysql/154220
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> Thanks Roger
>
> That fixed the problem.....I was under the impression that I only had to
put
> the linked columns n the ON and everything else in the WHERE....live an
> learn I guess.

Ehm, I'm not completely sure, but isn't this invalid behaviour? Can you post
the DDL and INSERT INTO data for these tables?

With regards,

Martijn Tonies
Database Workbench - developer tool for InterBase, Firebird, MySQL & MS SQL
Server.
Upscene Productions
http://www.upscene.com

> > * Rory McKinley
> > [...]
> > > SELECT a.line_number, a.category_value, IFNULL(b.parameter_trigger, 0)
> > > FROM DB1.Table 1 AS a LEFT JOIN DB2.Table 2 AS b ON
> > > a.category_name = b.parameter_value
> > > WHERE a.line_type = 13 AND b.parameter_ID = 13
> > >
> > > The only problem is that the query only returns the first two
> > > records and not the third record - contrary to my expectations. I
> > > am using MySQL 4.0.15-standard together with PHPMyAdmin 2.5.3.
> > >
> > > Does anybody know what I am doing wrong?
> >
> > You have a criteria on the B table in the WHERE clause. Move it to the
ON
> > clause:
> >
> > SELECT ... AS b ON
> >     a.category_name = b.parameter_value AND
> >     b.parameter_ID = 13
> >   WHERE a.line_type = 13
> >
> > --
> > Roger