title: Get employees who worked in more than one department with SQL query
body: <p>I'm trying to figure out a query which shows the names of the employees who worked in more than 2 departments along with their wage and contact details. I have two tables employees and department. Both of these having the EmployeeName field. I know we have to use the Count function but don't really know how to create the query. </p>
  
  <p>here the tablename and Fields:</p>
  
  <ul>
  <li><code>Employee</code> (employeeName, wage, contactNo)</li>
  <li><code>Department</code> (employeeName, departmentNo, hours, startDate) </li>
  </ul>