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TheMultics Relational Data Store, orMRDS for short, was the first commercialrelational database management system. It was written inPL/1 byHoneywell for theMulticsoperating system and first sold in June 1976.[1] Unlike theSQL systems that emerged in the late 1970s and early 80s, MRDS used a command language only for basic data manipulation, equivalent to theSELECT orUPDATE statements in SQL. Other operations, like creating a new database, or general file management, required the use of a separate command program.
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