title: How does "for each row" work in triggers in mysql?
body: <p>In mysql triggers, when I do a "after update" on table <code>A</code> and then use "for each row", will it run the body of the trigger for each row in <code>A</code> every time a row gets updated in <code>A</code>, or is it saying to apply the trigger to every row in <code>A</code> and then if a row gets updated, it will only run the body code for that updated row only?</p>
  
  <p>Thanks </p>