whose queries require joins—is: 20. Which database type—e.g.: NoSQL or DBMS — key-value data store or object-relational database —e.g.: Redis or PostgreSQL —and web-framework —e.g. Django , Web2Py or Flask —would you recommend? I am building a project requiring high performance and scalability, entailing: - Role-based authentication< http://en.wikipedia.org/wiki/Role-based_access_control>with API-key< http://en.wikipedia.org/wiki/Application_programming_interface_key>licensing to