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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
UPDATE statements in SQL. Other operations, like creating a new database, or general file management, required the use of a separate command program.
- Paul McJones, "Multics Relational Data Store (MRDS)"