IBM SQL/DS
SQL/DS (Structured Query Language/Data System), released in 1981, was IBM's first commercial relational database management system.[1] It implemented the SQL database query language.
SQL/DS ran on the DOS/VSE and VM/CMS operating systems. A little later, IBM also introduced DB2, another SQL-based DBMS, this one for the MVS operating system. The two products have coexisted since then; however, SQL/DS was rebranded as "DB2 for VM and VSE" in the late 1990s.
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