Notice: Undefined variable: sql in /opt/lampp/htdocs/webserver/medical/getdata/condb.php on line 21

Warning: mysqli_query(): Empty query in /opt/lampp/htdocs/webserver/medical/getdata/condb.php on line 21

Fatal error: Uncaught Error: Call to a member function fetch() on bool in /opt/lampp/htdocs/webserver/medical/index.php:84 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/webserver/medical/index.php on line 84