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IBM SQL/DS
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<p>SQL/DS (Structured Query Language/Data System), released in 1981, was <a href="/facts/IBM/QszA7nwd">IBM</a>'s first commercial relational-database management system. It implemented the <a href="/facts/SQL/UjQLJcYm">SQL</a> database-query language. </p><p>SQL/DS ran on the <a href="/facts/DOS/VSE/b6Hnxc2p">DOS/VSE</a> and <a href="/facts/VM_(operating_system)/Ymu9SRtX">VM/CMS</a> operating systems. A little later, IBM also introduced <a href="/facts/IBM_DB2/2cYITuuY">Db2</a>, another SQL-based DBMS, this one for the <a href="/facts/MVS/VPSmB9ML">MVS</a> operating system. The two products have coexisted since then; however, SQL/DS was rebranded as "DB2 for VM and VSE" in the late 1990s. </p>