By Toby J. Teorey, Sam S. Lightstone, Thomas P. Nadeau
Database platforms and database layout expertise have passed through major evolution lately. The relational information version and relational database platforms dominate enterprise functions; in flip, they're prolonged via different applied sciences like info warehousing, OLAP, and information mining. How do you version and layout your database software in attention of recent expertise or new enterprise wishes?
In the broadly revised fourth version, you ll get transparent reasons, plenty of excellent examples and an illustrative case, and the quite sensible suggestion you've come to count number on--"with layout principles which are appropriate to any SQL-based system." yet you ll additionally get lots that will help you develop from a brand new database dressmaker to an skilled dressmaker constructing industrial-sized systems.
+ a close examine the Unified Modeling Language (UML-2) in addition to the entity-relationship (ER) method for information specifications specification and conceptual modeling--with examples during the e-book in either ways!
+ the main points and examples of ways to exploit information modeling techniques in logical database layout, and the transformation of the conceptual version to the relational version and to SQL syntax;
+ the basics of database normalization in the course of the 5th basic form;
+ sensible insurance of the most important concerns in enterprise intelligence--data warehousing, OLAP for choice help structures, and knowledge mining;
+ examples for the way to take advantage of the most well-liked CASE instruments to deal with complicated facts modeling difficulties.
+ routines that attempt realizing of all fabric, plus suggestions for lots of exercises."
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Extra info for Database Modeling and Design: Logical Design
Example text
8, suppose the root entity Worktask has two associated entities, External-project and Internal-project. At most one of the associated entity instances could apply to an instance of Work-task. A work task can be assigned to either an external project or an internal project, but not both. 6 Referential Integrity We note that a foreign key is an attribute of a table (not necessarily a key of any kind) that relates to a key in another table. Referential integrity requires that for every foreign key instance that exists in a table, the row (and thus the key instance) of the parent table associated with that foreign key instance must also exist.
For example, a given car might have VIN 1NXBR32ES3Z126369 and a mileage of 22,137 miles. ” Classes and objects are a natural way of conceptualizing the world around us. The concepts of classes and objects are also the paradigms that form the foundation of object-oriented programming. The development of object-oriented programming led to the need for a language to describe object-oriented design, giving rise to UML. There is a close correspondence between class diagrams in UML and ER diagrams. Classes are analogous to entities.
The “Car” class is more general than the “Sedan” class. Generalization is indicated by a solid line adorned with a hollow arrowhead pointing to the more general class. 1 shows generalization from the Sedan class to the Car class. 2 Class Diagrams for Database Design The reader may be interested in the similarities and differences between UML class diagrams and ER models. 5 parallel some of the figures in Chapter 2, allowing for easy comparison. 6. 10. 2 illustrates UML constructs for relationships with various degrees of association and multiplicities.