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by snaky 2868 days ago
Integrity (consistency) was the biggest point of relational database theory itself.

> The true importance of relational theory is highlighted by the title of the original (and considerably shorter) version of Codd’s first paper. That version predated the published version by a year, and the title was “Derivability, Redundancy, and Consistency of Relations Stored in Large Data Banks.”[1] The title of this unpublished version emphasizes that the real importance of relational theory is that it provides a rigorous method of asserting arbitrarily complex consistency constraints that must be satisfied by the data within the database.

https://iggyfernandez.wordpress.com/2013/04/24/whats-so-sacr...

[1] http://www.liberidu.com/blog/images/rj599.pdf