Polypheny is a multi-model DBMS built on top of HSQLDB.
SQL Cypher HTTP / REST
Polypheny supports their proprietary dialect of SQL called "PolySQL", as well as with compatibility with MongoDB's query language.
Materialized Views
N-ary Storage Model (Row/Record)
Disk-oriented
Relational Document / XML Graph
Shared-Everything
https://polypheny.com/
https://github.com/polypheny/Polypheny-DB
https://docs.polypheny.com/
@polypheny
Polypheny GmbH, University of Basel
CH
2017
Academic, Commercial, Open Source
Java
HyperSQL
MongoDB, Neo4j
Linux, OS X, Windows
Apache v2