RE: Quick question re outer joins

If Table A is the driver and the table we always want a row to be returned from and we join it to table B with the "(+)" on the B side of the where clause conditions. Now Table B has 0 or more rows for every row in A. When there is no match the row in A is still returned. When there is a match the row in A is returned for each and every match in B just as in normal inner join. So if 3 three rows in B that share the join keys with A you will get 2 extra rows compared to just a count(*) from A based on the A table where conditions.

HTH -- Mark D Powell --

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Nuno Souto Sent: Friday, July 23, 2004 10:07 AM
To: oracle-l_at_freelists.org
Subject: Re: Quick question re outer joins

jo_holvoet_at_amis.com apparently said,on my timestamp of 23/07/2004 6:50 PM:

> If the relationship to the new table is 1-N, it could potentially add rows

> just like a regular join, couldn't it ?

How?
If it finds a corresponding row, it puts its column value in the output. If it doesn't, it puts a NULL there. How can that add rows?

-- 
Cheers
Nuno Souto
in sunny Sydney, Australia
dbvision_at_optusnet.com.au
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