Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group by year(added_on)' at line 5 in /var/www/html/digitalskills/course_details.php:14 Stack trace: #0 /var/www/html/digitalskills/course_details.php(14): mysqli_query() #1 {main} thrown in /var/www/html/digitalskills/course_details.php on line 14