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 '' at line 1 in /var/www/html/st/demo/php/retrieve-image.php:4 Stack trace: #0 /var/www/html/st/demo/php/retrieve-image.php(4): mysqli_query() #1 {main} thrown in /var/www/html/st/demo/php/retrieve-image.php on line 4