March 2003
Beginner
672 pages
14h
English
book
Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
by Michael J. Hernandez
Content preview from Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
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Resolving a Multivalued Field
Use this generic procedure to resolve a multivalued field:
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Remove the field from the table and use it as the basis for a new table. If necessary, rename the field in accordance with the field name guidelines that you learned earlier.
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Take the primary key from the original table and incorporate it into the new table structure. This field will perform two specific functions in the new table: It will serve as part of the table's composite primary key, and it will serve as a foreign key that helps to establish the relationship between the new table and the original table.
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Assign an appropriate name, type, and description to the new table and add it to the final table list.
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