Transcription of The Relational Data Model - Stanford University
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The Relational Data Model - Stanford University
CHAPTER 8.. The Relational Data Model One of the most important applications for computers is storing and managing information. The manner in which information is organized can have a profound effect on how easy it is to access and manage. Perhaps the simplest but most versatile way to organize information is to store it in tables. The Relational Model is centered on this idea: the organization of data into collections of two-dimensional tables called relations. We can also think of the Relational Model as a generalization of the set data Model that we discussed in Chapter 7, extending binary relations to relations of arbitrary arity. Originally, the Relational data Model was developed for databases that is, Database information stored over a long period of time in a computer system and for database management systems, the software that allows people to store, access, and modify this information.
SEC. 8.2 RELATIONS 405 Course StudentId Grade CS101 12345 A CS101 67890 B EE200 12345 C EE200 22222 B+ CS101 33333 A− PH100 67890 C+ Fig. 8.1. A table of information.
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