Hi Buntu,
Possibly, following schema can help?
Rowkey with columns user, X, Y, timestamp. (Composite PK with user as leading 
column). You can MD5 each field to make it fixed length if want.Then, also make 
timestamp column as your secondary index. Salt the table.
I think single table is enough here.
Thanks,Sumit
      From: Buntu Dev <buntu...@gmail.com>
 To: user@phoenix.apache.org 
 Sent: Saturday, October 3, 2015 7:25 AM
 Subject: Schema design
   
I'm trying to design the Phoenix/HBase table schema in order to answer these 
questions:
* Does the given user have attribute X with value Y? and at given time t1.* Get 
list of users who had attribute X with value Y between timestamps t1 and t2?* 
Get all the attributes of user at or around a given time t1.
Is there a way to design the schema (or multiple table schema) to answer these 
questions and if there are any restrictions on querying using Phoenix? Please 
let me know.

Thanks!

   

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