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Line 2: {{refimprove\|date=January 2014}} 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.<ref>{{cite news \|last1=Leavitt \|first1=Don \|title=MDBM' Backs Network, Relational Approaches \|url=https://books.google.iecom/books?id=OohpOVF5L-IC&pg=PA11~~#v=onepage&q&f=false~~ \|work=Computerworld \|publisher=IDG Enterprise \|date=6 September 1976 \|language=en}}</ref> 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 <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. ==References== {{Reflist}} {{refbegin}} *Paul McJones, [http://www.mcjones.org/System_R/mrds.html "Multics Relational Data Store (MRDS)"]