How to make sorting for every columnt?

[0xAX]

For example i have a table with 2 columns:

<table ng-table="tableParams" class="table">

        <th>
            First name
        </th>

        <th>
            Second name
        </th>

        <tr ng-repeat="user in users">
            <td data-title="'Name'" sortable="name">
                {{user.name}}
            </td>

            <td data-title="'SecondName" sortable="second_name">
                {{user.secondname}}
            </td>
        </tr>
</table>

How to do sorting for every columns? I want to click at first <th> and sort first column, click at second <th> sort second column.

Thank you.

[esvit]

<table ng-table="tableParams" class="table">
        <tr ng-repeat="user in users">
            <td data-title="'First name'" sortable="name">
                {{user.name}}
            </td>

            <td data-title="'Second name'" sortable="second_name">
                {{user.secondname}}
            </td>
        </tr>
</table>