Why am I unable to query my sqlite db?

Can I Query Cassandra columns with Pycassa?

• I have Cassandra DB similar to this: key | name | client 1        A               C1 2        B          C2 3        C          C1 I access to my cassandra db with Pyhton (pycassa). Is there a way to query the database in order to get the clients with the most number of occurrences. For instance in this case it is C1 with 2. I am not sure if it is possible to directly query cassandra with pycassa. If it is possible, how can i achieve that or should i use extra tools? Thanks PS: I need to use nosql so please do not suggest me to use relational db.

• Answer:

  No, there is no built-in way of doing that. You would need to keep track of occurrences manually using Counter Columns (http://www.datastax.com/dev/blog/whats-new-in-cassandra-0-8-part-2-counters). You can create a Counter row per Client and increment/decrement every time you insert/delete rows in your main column family.