A Relational Model of Data for Large Shared Data Banks.

E. F. Codd A Relational Model of Data for Large Shared Data Banks. 377-387 1970 13 Commun. ACM 6 db/journals/cacm/cacm13.html#Codd70 http://doi.acm.org/10.1145/362384.362685 CACMs1/CACM13/P377.pdf ... ... ... ... ... ... ... ... ... ...