Codd E.F. The Relational Model For Database Management. Version 2

Addison-Wesley, 1990. — 538 p.Written by the originator of the relational model, this book covers the practical aspects of the design of relational databases. The author defines twelve rules that database management systems need to follow in order to be described as truly relational and then gives the motivation behind these rules. This book is a perfect resource for students and professionals in the field.