Do i need triggers for this?

Hi guys, Lets say I have a table called 'employees', and another table called 'training_history'. Lets say I need to delete an employee, I would also have to delete his record in the 'training_history' table. Which is the best way to go about this? Controlling it at application level? Or should I need triggers (I'm using postgresql). If the latter, how do I create triggers for this kind of situation in postgresql? Thanks. Regards, Faisal ______________________________________