A Co-Relational Model of Data for Large Shared Data Banks (2011)

> In this article we present a mathematical data model for the most common noSQL databases—namely, key/value relationships—and demonstrate that this data model is the mathematical dual of SQL's relational data model of foreign-/primary-key relationships. Following established mathematical nomenclature, we refer to the dual of SQL as coSQL. We also show how a single generalization of the relational algebra over sets—namely, monads and monad comprehensions—forms the basis of a common query language for both SQL and noSQL. Despite common wisdom, SQL and coSQL are not diabolically opposed, but instead deeply connected via beautiful mathematical theory.

I'm such a nerd, this makes me happy.

I read this paper back in 2011, and it looked like an interesting way to address the impedance mismatch between OOP and relational databases.

Were there any follow-up papers or proof-of-concept software based on these ideas?

This is an article written by someone who never heard of Graph Databases. The publish year was 2011, so that makes sense. They were not as well known 6 years ago.

2011