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The '''Multics Relational Data Store''', or '''MRDS''' for short, was the first commercial [[relational database management system]]. It was written [[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 80's, MRDS used a command language only for basic data manipulation, equivalent to the <code>SELECT</code> or <code>UPDATE</code> 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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