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Absolute Beginner’s Guide to Databases by John V. Petersen

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The Relational Database Model: An Overview

In 1970, IBM researcher Dr. E. F. Codd published a paper titled “A Relational Model of Data for Large Shared Data Banks.” In this paper, Dr. Codd proposed a new theory of representing data structures that was primarily mathematical in nature. The theory also proposed new mathematical models for accessing and manipulating a database. In recognizing some of the limitations that could be encountered, Dr. Codd formulated rules for normalizing a database. The rules of data normalization are discussed in detail in Chapter 4.

The previous section discussed several “relational” database systems available on the market today. The use of the word relational in this context troubled Dr. Codd. His concern was ...

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