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A relational database management system, based on the principles laid down in the book "Databases, Types, and The Relational Model: The Third Manifesto" by C. J. Date and Hugh Darwen.
...It uses a SQL-like language that lets you describe your workflow and business processes, and uses this information to enforce your business rules and guarantee data integrity.
JucaDB is a relational database engine written in Java, supporting a subset of ANSI SQL-92. There is a JDBC driver with full suport. Client-server, referential-integrity and other features are implemented.