> There is as yet no absolute challenger to the relational model. When people think database, they still think SQL. But if there is a true challenger, it is in

> There is as yet no absolute challenger to the relational model. When people think database, they still think SQL. But if there is a true challenger, it is in the graph model. Because graph data structures power social networks, and social networks are the dominant technological organism of the era. You can use a fact database model (like Datomic's) and then you don't have to choose between row, column, document and graph based databases, those are projections on top of some index. If entities are universally unique and attributes namespaced you can get a "database of everything". Or you need at least a mapping between entities from different vendors. That's the hard part :)