Appendix B. Reviewing relational databases

Relational databases have been an integral part of enterprise development for a few decades now. The fact that these business data storage mainstays are backed by their own body of mathematical theory (relational algebra) speaks to the elegance and robustness of this mature technology. E. F. Codd first introduced the theory of relational databases in 1970 while working at IBM. This groundbreaking research eventually led to the creation of today’s database products, including IBM’s own highly successful DB2 database. Oracle is the most popular database in existence today, in vibrant competition with products like Microsoft SQL Server, Sybase, MySQL, and many others, in addition to IBM’s DB2. Fundamentally, ...

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