By Toby J. Teorey
Database platforms and database layout expertise have passed through major evolution in recent times. The relational facts version and relational database structures dominate company functions; in flip, they're prolonged by means of different applied sciences like facts warehousing, OLAP, and knowledge mining. How do you version and layout your database software in attention of latest expertise or new company wishes? within the widely revised 5th version, you will get transparent reasons, plenty of outstanding examples and an illustrative case, and the relatively functional recommendation you will have come to count number on--with layout principles which are appropriate to any SQL-based method. yet you will additionally get lots that will help you develop from a brand new database clothier to an skilled dressmaker constructing industrial-sized systems. In-depth element and many real-world, sensible examples all through Loaded with layout principles and illustrative case experiences which are acceptable to any SQL, UML, or XML-based procedure instantly valuable to a person tasked with the production of knowledge versions for the combination of large-scale firm facts.
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Additional resources for Database Modeling and Design, Fifth Edition: Logical Design
The degree of a relationship is the number of associated entities: two (binary), three (ternary), or any n (n-ary). The role (name), or relationship name, defines the function of an entity in a relationship. The concept of existence in a relationship determines whether an entity instance must exist (mandatory) or not (optional). So, for example, the minimum connectivity of a binary relationship—that is, the number of entity instances on one side that are associated with one instance on the other side—can either be zero, if optional, or one, if mandatory.
For example, Sedan is a type of car. 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. Class Diagrams for Database Design The reader may be interested in the similarities and differences between UML class diagrams and ER models. 5 are parallel to some of the figures in Chapter 2, allowing for easy comparisons. 6. 10. 2 illustrates UML constructs for relationships with various degrees of association and multiplicities.
Specialization, the reverse of generalization, is an inversion of the same concept; it indicates that subtypes specialize the supertype. A supertype entity in one relationship may be a subtype entity in another relationship. When a structure comprises a combination of supertype/subtype relationships, that structure is called a supertype/subtype hierarchy, or generalization hierarchy. Generalization can also be described in terms of inheritance, which specifies that all the attributes of a supertype are propagated down the hierarchy to entities of a lower type.