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HBase >> mail # user >> hbase many-to-many design

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hbase many-to-many design
Hi 'user',

     This is a many-to-many question, I also infer the hbase design FAQ,
     What I want to do is desinging a 'user' table, incluing 'user' basic
infomations(columnFamily1), and team-name 'user' joined in(columnFamily2),
     When a user join in a new Team, I want to update the 'user' table to
add a column to 'columnFamily2'. So when getting the user , I get all the
team-names the user join in.
     Yet I don't want to put duplicate records, known as multi-versions,
each user has only one record.
     What should I do?

    Any advice will be appreciated!
Thanks & Best Regards