title: Get Notification Whenever MySQL table is updated in PHP without any refresh and without much Load on the Server
body: <p>I am developing a card game.
  The Logic is 1st player waits till any player joins.
  When 2nd player comes to that page, an update in database is made and Player 1 will get a notification that Player 2 has joined without refreshing the page.
  I have searched a tons of <strong>jquery and ajax</strong> but none helped me. Please Someone help me as i am stuck in the middle of nowhere. Thanks.</p>