By Toby J. Teorey
I assumed the early chapters had a few reliable details, yet it truly is details i will be able to locate in another books that i have already learn. prior versions of this e-book could have been there first chronologically, i do not comprehend. i actually have issues of bankruptcy 6 on Normalization: i believe the most instance (figure 6.2) is particularly non-intuitive (report_no is not a prime key for the file table--it looks a one-to-one courting with editor, dept_no, dept_name, and dept_addr in accordance with the small pattern data). also, the instance time and again states that there's just one candidate key during this desk. the information pattern does not appear to endure that out. I additionally imagine it'll were greater if the writer had given an instance of ways a desk will possibly not meet the 1st general shape, instead of simply beginning with an instance of a desk that's. i believe the definition of 2NF is vague, even supposing the instance and answer are right. i believe the full subject (of Normalization) is roofed even more in actual fact and realistically via Clare Churcher in "Beginning Database Design".
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Extra info for Database Modeling and Design: Logical Design, 4th Edition (The Morgan Kaufmann Series in Data Management Systems)
There may be certain information related to a party that applies only to a specific role. For instance, credit information may be applicable only to customers and thus be a relationship or attribute of this role only. Specific relationships may be applicable only to certain roles. For instance, the relationship from the entity EMPLOYMENT with a "from date" and "start date" is specifically related to a role of employee. Are these roles just subtypes of the party entity, or is there a PARTY ROLE entity to indicate that each PARTY may act in one or more PARTY ROLEs?
This PARTY entity will enable storage of some of the common characteristics and relationships that people and organizations share. People and Organizations Parties are classified into various categories using the entity PARTY CLASSIFICATION, which stores each category into which parties may belong. There are subtypes for ORGANIZATION CLASSIFICATION such as INDUSTRY CLASSIFICATION, SIZE CLASSIFICATION, and MINORITY CLASSIFICATION as well as subtypes to categorize people such as EEOC (Equal Employment Opportunity Commission) CLASSIFICATION and INCOME CLASSIFICATION.
This single entity allows the data models to refer to either a person or an organization as a party to a transaction. The table shows our previous examples of organizations and people along with the PARTY TYPEs that serve to classify them according to various demographic categories. Organizations and people may be classified several ways, thus the need for the many-to-many relationship between PARTY and PARTY TYPE. " People may be classified into various categories such as EEOC CLASSIFICATION types as well as other personal classifications such as INCOME CLASSIFICATION.