It's not really news that nosql is a vague and unhelpful term. if you lump together things like couchdb, a document database built for replication and Casandra

It's not really news that nosql is a vague and unhelpful term. if you lump together things like couchdb, a document database built for replication and Casandra a wide column database built for big data storage, pretty much everything is going to be a maybe as those databases are more different from each other then they are from SQL. The real cheat sheet for SQL vs nosql is: A concept that refers to something specific: SQL 1, nosql 0