MySQL Workbench
The Triggers subtab opens a workspace that enables you to create new triggers or edit existing triggers. All triggers are organized within a tree structure by section, such as BEFORE INSERT and AFTER INSERT.
      To add a new trigger, click the
      [+] icon next to the trigger
      section. To delete a trigger, click the associated
      [-] icon. These icons become
      visible by hovering over a trigger or trigger section. Click
       to commit your changes. The next
      figure shows an example of the
      customer_create_date trigger.