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From Stuti Awasthi <stutiawas...@hcl.com>
Subject RE: Hbase query
Date Thu, 18 Aug 2011 07:04:37 GMT
Thanks Buttler !

-----Original Message-----
From: Buttler, David [mailto:buttler1@llnl.gov] 
Sent: Wednesday, August 17, 2011 9:13 PM
To: user@hbase.apache.org
Subject: RE: Hbase query 

One way to do it would be to drop the sales_id and use a composite key of user_id/product_id
(assuming that a user may only by one product).  Then you could do a simple get("xyz/123")
to get the full row.  If you wanted to get the email of people who bought product "123", then
a row key of product/user might be more useful. Then you could scan starting at "123", ending
at "123\0".  

However, you need to ask the question: Since you already have an RDBMS that works, why do
you want to switch to HBase?  If it is because you have a lot of transaction data (really?
Main memory is getting pretty big these days...), maybe you want to store user info in the
RDBMS and just the transaction data in HBase.


-----Original Message-----
From: Stuti Awasthi [mailto:stutiawasthi@hcl.com]
Sent: Wednesday, August 17, 2011 8:19 AM
To: user@hbase.apache.org
Subject: Hbase query 

Hi all

I have read that Hbase query will depend on <Row-Key> only . I was trying to map my
tables of RDBMS to HBASE and was thinking way out for the following ?

RDBMS Schema :

Table Sales

*         Sales_Id (PK)

*         User_Id     (FK)

*         Product_ID (FK)

*         Name

*         Mobile

*         Email

Query : Select Name , Mobile, Email from Sales where User_id= "xyz" and Product_Id= "123"

This query is fairly simple in RDBMS because we can query based on columns. How to do this
efficiently in Hbase ?


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