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  Oracle Tips by Burleson

Employee Entity

In the above example, the employee entity has the attributes defined as emp_num (employee number), ssn, emp_name, hire_date and dept.  The primary key (unique identifier) is the employee number, identified as the key because it is underlined.  There are some key things to note about the employee entity.   

First, all employees are going to be in a department, so the dept attribute will have a lot of redundant information in it.  Also, the department is not dependent on the emp_num key, so we need to split it out into its own entity.  Secondly, you might want to use the social security number (ssn) as the primary key; however, this will limit your design to just persons with a ssn.  No persons from other countries, since they will not have a ssn.  Finally, employee name should be broken up into subelements such as first, middle initial and last name.
 

The above book excerpt is from:

Easy Oracle SQL

Get Started Fast writing SQL Reports with SQL*Plus

ISBN 0-9727513-7-8

Col. John Garmany 

http://www.rampant-books.com/book_2005_1_easy_sql.htm

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