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Extra resources for Database modeling & design : logical design
Another use for packages is to group related classes together within a schema, and present the schema clearly. Given a set of classes, different people may conceptualize different groupings. The division is a design decision, with no right or wrong answer. Whatever decisions are made, the result should enhance readability. The notation for a package is a folder icon, and the contents of a package can be optionally shown in the body of the folder. If the contents are shown, then the name of the package is placed in the tab.
The [0 .. , is upper management), or one Department. Mandatory existence is specified whenever a multiplicity begins with a positive integer. 2 means an Employee is an occupant of exactly one Office. book Page 40 Saturday, July 16, 2005 12:57 PM 40 CHAPTER 3 The Unified Modeling Language (UML) association can indicate mandatory existence, while the other end may use optional existence. This is the case in the example, where an Office may have any number of occupants, including zero. Generalization is another type of relationship; a superclass is a generalization of a subclass.
1d for UML. The employee works on a project located in a city, so the “works-in” relationship between Employee and City is redundant and can be eliminated. Ternary Relationships Define ternary relationships carefully. We define a ternary relationship among three entities only when the concept cannot be represented by several binary relationships among those entities. For example, let us assume there is some association among entities Technician, Project, and Notebook. 2c for UML). 2d for UML). The approach to take in ER modeling is to first attempt to express the associations in terms of binary relationships; if this is impossible because of the constraints of the associations, try to express them in terms of a ternary.