March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
Content preview from Introduction to the New Mainframe: z/VSE Basics
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Chapter 12. Database management systems on z/VSE 297
12.5.1 Entities
A database contains information about entities. An entity is something that:
Can be uniquely defined
We may collect substantial information about, now or in the future
In practice, this definition is limited to the context of the applications and business
under consideration. Examples of entities are parts, projects, orders, customers,
trucks, and so on. It should be clear that defining entities is a major step in the
database design process. The information we store in databases about entities is
described by data attributes.
12.5.2 Data attributes
A data attribute is a unit of information that specifies a fact about an entity. For
example, suppose the entity is a part. Name=W ...
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