Database Modeling and Design: Logical Design, 4th Edition by Toby J. Teorey

By Toby J. Teorey

I presumed the early chapters had a few solid details, yet it truly is info i will be able to locate in another books that i have already learn. previous versions of this ebook can have been there first chronologically, i do not be aware of. i actually have issues of bankruptcy 6 on Normalization: i believe the most instance (figure 6.2) is especially non-intuitive (report_no isn't really a chief key for the record table--it looks a one-to-one dating with editor, dept_no, dept_name, and dept_addr in keeping with the small pattern data). also, the instance many times states that there's just one candidate key during this desk. the information pattern does not appear to undergo that out. I additionally imagine it will were larger if the writer had given an instance of ways a desk will possibly not meet the 1st basic shape, instead of simply beginning with an instance of a desk that's. i feel the definition of 2NF is vague, even though the instance and resolution are right. i feel the full subject (of Normalization) is roofed even more sincerely and realistically via Clare Churcher in "Beginning Database Design".

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An INTERNAL ORGANIZATION is an organization that is part of the enterprise for whom the data model is developed. 35 36 Chapter 2 Common Party Role Subtypes These subtypes are intended in order to provide a list of common subtypes used in most enterprises, and it should be understood that each enterprise may modify this list of subtypes to suit its own specific needs. Therefore, each PARTY ROLE may be described by one and only one PARTY ROLE TYPE. The PARTY ROLE TYPE is a subtype of ROLE TYPE that has a description attribute that stores available values of role types.

The intersection entity PARTY CONTACT MECHANISM shows which contact mechanisms are related to which parties. The CONTACT MECHANISM TYPE entity maintains allowable values for different types of contact mechanisms, for example, "phone," "mobile phone," "fax number," "e-mail address," and so on. CONTACT MECHANISMS are subtyped to include TELECOMMUNICATIONS NUMBER and ELECTRONIC ADDRESS. TELECOMMUNICATIONS NUMBER includes any access via telecommunications lines such as phones, faxes, modems, pagers, and cellular numbers.

If there is no Vx in front of the reference, then the reader may assume that the figure is in the current volume. The Companion CD-ROM This book and its appendices provide very detailed descriptions of the models discussed. The diagrams lay out all the relationships, the mandatory attributes and columns, the primary keys, and they even include some optional attributes. The appendices include the physical details for the attributes and columns, such as the datatype and size. With this information, it would be possible for a data modeler or database designer to recreate these models in the tool of his or her choice or write the SQL code to build them in a database.

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