IBM IS1

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. It had limited facilities but implemented a true relational model. It was the precursor to PRTV.

References

1. IS1
2. List of relational database management systems
3. IBM Peterlee Relational Test Vehicle
4. Relational database
5. C0 and C1 control codes