title: mysql conditional insert on duplicate update - multiple records
body: <p>How can I use the <code>ON DUPLICATE UPDATE</code> with a multiple value INSERT? </p>
  
  <pre><code>INSERT INTO tbl_name 
    (key_id,field1,filed2) 
  VALUES
    (1,2,3),
    (1,5,6),
    (1,8,9);
  </code></pre>