title: Drop trigger if exists in MySQL
body: <p>I need to execute a command similar to the following not inside a procedure but inside a simple sql file for mysql 5.xx</p>
  
  <pre><code>IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME =  'tr_fnninio_censopersona_ins') THEN
      DROP TRIGGER tr_fnninio_censopersona_ins;
  END IF;
  </code></pre>