August 2009
Intermediate to advanced
893 pages
26h 48m
English
Content preview from Database Systems: Concepts, Design and Applications
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4.3. Structure of Relational Database
Relational database system has a simple logical structure with sound theoretical foundation. The relational model is based on the core concept of relation. In the relational model, all data is logically structured within relations (also called table). Informally a relation may be viewed as a named two-dimensional table representing an entity set. A relation has a fixed number of named columns (or attributes) and a variable number of rows (or tuples). Each tuple represents an instance of the entity set and each attribute contains a single value of some recorded property for the particular instance. All members of the entity set have the same attributes. The number of tuples is called cardinality, and the ...
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