By Keng Siau

This paintings offers study rules and subject matters on the right way to improve database platforms, enhance info garage, refine latest database types, and increase complex functions. It additionally offers insights into vital advancements within the box of database and database administration.

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This verbalizes in ORM as: each Vehicle was purchased from a Company or leased from a Company but not both. In ORM, an exclusive-or constraint is an orthogonal combination of an inclusive-or constraint (circled dot) and an exclusion constraint (circled X), and may even be displayed as these two separate constraints if desired, as shown in Figure 15(b). Although UML lacks both an inclusive-or constraint and an exclusion constraint, it does include an exclusive-or constraint as a primitive constraint, using the notation “{xor}”.

2nd Edition). London: Addison Wesley. W. (2003a). A service-based approach to components for effective business-IT alignment. ), Practicing software engineering in the 21st Century. Hershey, PA: Idea Group Publishing. Copyright © 2004, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. W. (2003b). Component-oriented agile software development. Fourth International Conference on eXtreme Programming and Agile Processes in Software Engineering, May 26-29, 2003, Genova, Italy.

To save space, some obvious subtype definitions may be omitted from now on. Figure 5: ORM metaschema fragment for ORM populatable types and business rules Copyright © 2004, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 34 Halpin Figure 6: Metaschema fragment for main ORM object types and fact types Figure 6 shows another fragment of the ORM metschema. An object type either is primitive or is a subtype. A primitive object type is independent if its instances can exist independently of playing any role in a fact type.

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