DESC order results

Just wondering if anyone could tell me how reliable the DESC order option is going to be when I am parsing thousands of records where they are multiple ChartNo's for the same clientNo. Or is there a better way to grab the most recent ChartNo. $link = mysql_connect('localhost', 'myuser', 'mypassword') or die('Could not connect: ' . mysql()); mysql_select_db('mydatabase') or die('Could not select database'); $query = 'SELECT * FROM eChart WHERE clientNo = "2" ORDER BY ChartNo DESC'; $result = mysql_query($query) or die('Query failed: ' . mysql_error()); $line = mysql_fetch_array($result, MYSQL_ASSOC); // Just for testing.... print mysql_num_rows($result); Thanks, Dan -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.