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MySQL OUTER JOIN problem

MySQL OUTER JOIN problem

Post by Michael Fu » Fri, 29 Feb 2008 07:06:01


Does MySQL have some weird quirk regarding OUTER JOINs? I have this
query:

SELECT Date,P.Category,P.Person
FROM Bookings B RIGHT OUTER JOIN People P ON(B.Person=P.Person)
WHERE P.Category = '2' AND ((EndDate>='2008-02-01' And
Date<'2008-02-28') OR DATE IS NULL)

This works fine on DBISAM but on MySQL it is not including
non-matching records from the People table. Can someone explain why?

I thought it might be the Date field so I modified the SQL to just use
the EndDate field but still get a similar effect.

Thanks in advance.
 
 
 
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>

Yep. And it shouldn't.

Look at this old post of mine in another forum:
http://www.yqcomputer.com/

You must move your WHERE clause into the ON or you will continue to get
results like that.

SELECT RT.ReportName, COUNT(CR.ReportTypeID) AS CNT
FROM ReportType RT LEFT OUTER JOIN ClientReport CR
ON ( RT.ReportTypeID = CR.ReportTypeID
AND CR.ReportGUID = '9D973D11-6ACC-4079-B4F8-DF4A733ED760' )
GROUP BY RT.ReportName

The parens aren't needed in SQL Server, but they don't hurt. (They are
needed in Access.)

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