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Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'AND exam_id = ''' at line 1 in /home3/premsth1/public_html/test-website/notes/class-10/top_nav.php:16 Stack trace: #0 /home3/premsth1/public_html/test-website/notes/class-10/top_nav.php(16): mysqli_query() #1 /home3/premsth1/public_html/test-website/notes/class-10/index.php(97): include('/home3/premsth1...') #2 {main} thrown in /home3/premsth1/public_html/test-website/notes/class-10/top_nav.php on line 16