<table>
  <tr>
    <th ng-click="orderByColumn='name'; reverse=!reverse">Name</th>
    <th ng-click="orderByColumn='age'; reverse=!reverse">Age</th>
    <th ng-click="orderByColumn='salary'; reverse=!reverse">Salary</th>
  </tr>
  <tr ng-repeat="employee in employees | orderBy:orderByColumn:reverse">
    <td>{{employee.name}}</td>
    <td>{{employee.age}}</td>
    <td>{{employee.salary}}</td>
  </tr>
</table>

app.controller('EmployeeController', function($scope) {
  $scope.employees = [
    {name: 'John', age: 30, salary: 5000},
    {name: 'Alice', age: 25, salary: 4000},
    {name: 'Bob', age: 35, salary: 6000}
  ];
});