Using the descriptions of the attributes given in the figure, convert the ERD shown in Figure P6.2 into a dependency diagram that is in at least 3NF.

2 years ago
Database Management System

An initial dependency diagram depicting only the primary key dependencies is shown in Figure P6.2a below.

Figure P6.2a Initial dependency diagram for Problem 2.

Based on the descriptions of the attributes given, the following partial dependency can be determined:

Pres_SessionNum à (Pres_Date, Pres_Room)

Also, the following transitive dependencies can be determined:

Pres_AuthorID à (Pres_FName, Pres_LName)

Figure P6.2b shows the revised dependency diagram including the partial and transitive dependencies.

Figure P6.2b Revised dependency diagram for Problem 2

Resolving the partial dependency to achieve 2NF yields the dependency diagram shown in Figure P6.2c.

Figure P6.2c 2NF dependency diagram for Problem 2

Finally, the transitive dependency is resolved to achieve  the 3NF  solution shown in the final dependency diagram in Figure P6.2d.

Figure P6.2d Final dependency diagram for Problem 2

 

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Bijay Satyal
Bijay Satyal
Oct 25, 2021
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