KNOWPIA
WELCOME TO KNOWPIA
IBM IS1 
Summary
IS/1 was the world's first relational database system, implemented at the IBM United Kingdom Scientific Centre in Peterlee in the years 1970–1972.[1] It had limited facilities but implemented a true relational model. It was the precursor to PRTV.
References edit
- ^ Notley, M, "Peterlee IS/1 System", UKSC Report 18, 1972