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The Multics Relational Data Store, or MRDS for short, was the first commercial relational database management system. It was written in PL/1 by Honeywell for the Multics operating system and first sold in June 1976. Unlike the SQL systems that emerged in the late 1970s and early 80s, MRDS used a command language only for basic data manipulation, equivalent to the SELECT or UPDATE statements in SQL. Other operations, like creating a new database, or general file management, required the use of a separate command program.

References

• Paul McJones, "Multics Relational Data Store (MRDS)"

v t e Multics
Developer	MIT Bell Labs General Electric Honeywell Groupe Bull
People	David D. Clark Fernando J. Corbató Monte Davidoff Peter J. Denning Jack Dennis Stuart Feldman Robert M. Graham Bernard Greenberg Douglas McIlroy Robert Morris Peter G. Neumann Joe Ossanna Michael A. Padlipsky Dennis Ritchie Jerry Saltzer Glenda Schroeder Michael Schroeder Richard Soley Ken Thompson Tom Van Vleck Victor A. Vyssotsky
Software	Space Travel Maclisp Macsyma Multics Emacs Multics Relational Data Store
Multics-like systems	Domain/OS General Comprehensive Operating System GEORGE ICL VME Multiple Console Time Sharing System PRIMOS Stratus VOS
Related	Project MAC Compatible Time-Sharing System (predecessor)
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