if there are "Groups" & "Users", each User might belong to different Group,
How can I design the database so that I can easily find
"The common groups the 2 users are both in?"
In SQL, I will do join table, but in DynamoDB, how should I do it?
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That's the thing about NoSQL... it's not the right technology for every job. – Michael - sqlbot Dec 06 '15 at 23:35
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Possible duplicate of [How to join tables in AWS DynamoDB?](https://stackoverflow.com/questions/36753861/how-to-join-tables-in-aws-dynamodb) – Anirudh Ramanathan Jul 31 '19 at 20:41
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This is one way of doing it, as suggested by amazon, not nearly as easy as doing joins i sql. http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/EMRforDynamoDB.html?tag=duckduckgo-d-20
khebbie
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