Couchbase

This is NoSQL database(storing data in json structure) which offers SQL-compatible query language called SQL++ (N1QL nickel).
Developers familiar with SQL to easily query JSON data structure using SQL like queries.
This makes Couchbase a multi-model database that blends the strengths of both relational (SQL, ACID transactions) and NoSQL systems (flexibility, performance, scale) into a single platform.
Data in Couchbase Server is stored in the form of documents, not rows or columns.