Databases, Types and the Relational Model

C. J. Date is an independent author, lecturer, researcher, and consultant specializing in relational database systems. An active member of the database community for over 30 years, Date has devoted the major part of his career to exploring, expanding, and expounding the theory and practice of relational technology. He was also involved in technical planning for the IBN products SQL/DS and DB2 and his book, An Introduction to Database Systems, has sold well over half a million copies worldwide.



Hugh Darwen has been involved in software development since 1967 as an employee of IBM United Kingdom Ltd. He has been active in the relational database arena since 1978. His writings include contributions to Date's Relational Database Writings series and A Guide to the SQL Standard. He has been an active participant in the development of the SQL international standards since 1988.