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how to get the first 500 record from table in php mysql mysql

we are geting first 500 record form table using php and mysql

mysql_connect("hostname", "username","")
mysql_select_db("databasename");

$sql = "SELECT * FROM table ORDER BY id DESC LIMIT 50";
$result = mysql_query($sql);

  while ($query = mysql_fetch_assoc($result))



    {

    echo "$query[fieldname1] $query[fieldname2] <br/>";
}

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