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Meaning of (+) sign

MikailJun 7 2011 — edited Jun 7 2011
Sorry for the question as it might be too simple to ask here but I could find anything in the internet. I've been given a query part of which is like the following:

WHERE AN.NUMBER=BH.NUMBER(+)

What is that (+) sign in the where clause? Is it used only in Where clauses?

Edited by: Mikail on 07.06.2011 3:08
This post has been answered by Frank Kulash on Jun 7 2011
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Locked on Jul 5 2011
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