"A relational model of data for large shared data banks" http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.110.1845&rep=rep1&type=pdf http://citeseerx.is

"A relational model of data for large shared data banks" http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.110.1845&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.110... He gives criticism of the then existing databases (hierarchical and network), then proposes the relational model and the concept of a query language (though not an actual languages - this predates SQL). Interestingly, one of the hierarchical databases (IMS) is still going strong: http://en.wikipedia.org/wiki/Information_Management_System#History http://en.wikipedia.org/wiki/Information_Management_System#H...