Wikipedia
Transbase
Transbase is a relational database management system, developed and maintained by Transaction Software GmbH, Munich. The development of Transbase was started in the 1980s by Rudolf Bayer under the name „Merkur“ at the department of Computer Science of the Technical University of Munich (TUM).
Transbase largely conforms with the SQL standard „SQL2 intermediate level“ ( SQL-92) and supports various features of SQL2 follow-on versions (SQL:1999, SQL:2003 etc.).