Fatal error: Uncaught mysqli_sql_exception: Unknown column 'class' in 'WHERE' in /home/gardenci/public_html/ass/assstu6.php:18 Stack trace: #0 /home/gardenci/public_html/ass/assstu6.php(18): mysqli->query('SELECT * FROM t...') #1 {main} thrown in /home/gardenci/public_html/ass/assstu6.php on line 18