| Directory > Computers > Software > Databases > Relational > Implementations FirstSQL
Java in-memory SQL92 DBMS with sane NULLs processing. Purports to actually strive to follow Codd's
rules.
http://firstsql.com./
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LEAP
A non-SQL relational database using algebra. [Free software, GNU GPL]
http://leap.sourceforge.net/
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Multics Relational Data Store
RDBMS running under Unix's parent, Multics. Released June 1976, believed to be the first
relational DBMS offered by a major vendor: Honeywell.
http://www.mcjones.org/System_R/mrds.html
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Business System 12
A RDBMS designed to be strictly relational, unlike SQL. An important example of the model
independence of a particular implementation such as SQL.
http://www.mcjones.org/System_R/bs12.html
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System R
The first implementation corrupted from the relational model, was the basis for SQL and DB2. A site
preserving early history of a technology that became a critical business tool.
http://www.mcjones.org/System_R/
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rdb
Makers of a very simple quasi-relational database based on Unix shell commands.
http://www.rdb.com/
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