Which of the columns in the example are multivalued? Please make copy paste avai

Question

Which of the columns in the example are multivalued?

Please make copy paste available

The process of rejoining improve performance 10. Third Normal Form Things to Look Up 1. Look up database anomalies. See if you can find a good 2. Look up the definition of functional dependency. Can you 3. Look up the definition of transitive dependency. Can you example explaining each kind of anomaly find a good example? find a good example? Practices Charlie has a large book collection. He was keeping track of it in a spreadsheet, but it has grown big enough that he wants to convert it into a real database. Here is a sample from the spreadsheet: Author Author Country Titles James Taylor England JavaScript Essentials, South Tech Books, London, 2010, $14; HTML5 Exposed, Webby Books, London, 2012, S15.50 May Norton United States Big Data Big Promise, Data Press, San Francisco 2012, $25 Jessica Lewis United States Database Development for the Cloud, Data Press San Francisco, $20.35; Data Services, Future Tech Press, New York $12.95

Explanation / Answer

In the given example there are 3 columns: Author, Author Country, and Titles. Among all "Titles" column is multivalued. As in this column, Titles have multiple values. A single author can have one or more books published. And the column titles also contains more than one book names mentioned in it. This clearly represents the presence of multiple values in Titles and is categorized under multivalued attribute.

Because of this multivalued attribute, this table is not organized well. In a real database, these multivalued attributes are removed for the normalized database.

An entity with a multivalued attribute: converting into a real database

WIth all simple attributes in the given spreadsheet

With primary key and multivalued attribute:

Author Author Country James Taylor England May Norton United States Jessica Lewis United States

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