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Message from discussion Join multiple collections on multiple keys using map reduce in Mongo DB.
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Anand Dayalan  
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 More options Sep 26 2012, 7:55 pm
From: Anand Dayalan <anand.daya...@gmail.com>
Date: Wed, 26 Sep 2012 16:55:03 -0700 (PDT)
Local: Wed, Sep 26 2012 7:55 pm
Subject: Join multiple collections on multiple keys using map reduce in Mongo DB.
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I know a way to join multiple collections using a same key, and I thinks
its not possible to join multiple collections on multiple keys but
wondering anyone know a way to do it.

Lets say I have a collection AAA with fields A, B, and C, and I have a
collection called BBB with fields B, D and E, and I have another collection
called CCC with fields C, F, G.

In collection AAA field B is DB Ref for field B in collection BBB, and
field C in collection AAA is a DB ref for field C in collection CCC. Now I
want join these three collections like AAA join BBB on AAA.B =BBB.B , BBB
join CCC on BBB.C = CCC.C.

I know that I can embed one collection in another but I have a situation
where I can't embed everything but need to do a adhoc report across
multiple collection. So how do I do it?


 
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