The above are six tables for a company mini world. The company has employees, departments, buildings, which department$($s$)$ an employee works in $($and a percentage of the time for each$),$ department managers $($possibly more than one per department$),$ and in which building an employee works $($an employee may have more than one office$).$ The primary key of each table is the attribute$($s$)$ in capitals.

Note that: BName and DName are Unique. Other attributes are not necessarily unique.