# Join across Multiple DBs

**URL:** <https://www.ruby-forum.com/t/join-across-multiple-dbs/112177>\
**Category:** Rails\
**Created:** [August 16, 2007, 2:47am UTC](https://www.ruby-forum.com/t/join-across-multiple-dbs/112177 "2007-08-16T02:47:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hbotadra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/e9bcb4/32.png) [@hbotadra](https://www.ruby-forum.com/u/hbotadra)\
**Post date:** [August 16, 2007, 2:47am UTC](https://www.ruby-forum.com/t/join-across-multiple-dbs/112177/1 "2007-08-16T02:47:10Z")

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Hi,

I was just wondering if joins across table in different DBs could be  
done using ActiveRecord? If yes, does anyway have an example for the  
same? I am confused so as to how would I use multiple connections  
within a single Model class. Any pointers greatly appreciated. Thanks  
in advance.

Regards,  
Harnish

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<div class="post-metadata">

**Author:** ![hbotadra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/e9bcb4/32.png) [@hbotadra](https://www.ruby-forum.com/u/hbotadra)\
**Post date:** [August 16, 2007, 4:59pm UTC](https://www.ruby-forum.com/t/join-across-multiple-dbs/112177/2 "2007-08-16T16:59:22Z")

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IMHO I don’t think you can unless the database supports linking  
tables across databases in a manner that’s transparent to the client  
(i.e. Oracle).