Should I include user_id in multiple tables?

Posted by Drarok on Stack Overflow See other posts from Stack Overflow or by Drarok
Published on 2010-03-26T00:01:13Z Indexed on 2010/03/26 0:03 UTC
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I'm at the planning stages of a multi-user application where each user will only have access their own data. There'll be a few tables that relate to each other, so I could use JOINs to ensure they're accessing only their data, but should I include user_id in each table? Would this be faster? It would certainly make some of the queries easier in the long run.

Thanks!

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