Because I was curious and you didn’t link to it, here is A Relational Model of Data for Large Shared Data Banks by EF Codd: https://www.seas.upenn.edu/~zives/03

Because I was curious and you didn’t link to it, here is A Relational Model of Data for Large Shared Data Banks by EF Codd: https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf