I'm sure you are a aware of this; but your primary key can not have duplicate values.
Since your employeeID is your primary key you won't be able to have two duplicate employeeId values.
Definition: The primary key of a relational table uniquely identifies each record in the table. It can either be a normal attribute that is guaranteed to be unique (such as Social Security Number in a table with no more than one record per person) or it can be generated by the DBMS (such as a globally unique identifier, or GUID, in Microsoft SQL Server). -
http://databases.about.com/cs/admini...primarykey.htm
If you have any additional relationships or indexes please post them.
- A.Kahtava