- IBM IS1
IS/1 [Notley, M, "Peterlee IS/1 System", UKSC Report 18, 1972] was the world's first
relational database system, implemented at theIBM United Kingdom Scientific Centre in Peterlee in the years1970 –1972 . It had limited facilities but implemented a true relational model. It was the precursor toPRTV .References
Wikimedia Foundation. 2010.