Find duplicate records in php mysql

To find duplicate records in php mysql database use this query.
It will list all duplicate entries which occurs more than once.

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  $sql = "SELECT email FROM users WHERE email in (
          SELECT email FROM users GROUP BY email 
          HAVING count(email) > 1)";
  $result = mysql_query($sql);
  while($row = mysql_fetch_array($result)){
      echo $row['email']."<br>";
  }