Fatal error: Uncaught mysqli_sql_exception: Unknown column 's.Subj_Status' in 'where clause' in C:\xampp\htdocs\e-service\bookconsis\pages\subject_field.php:104 Stack trace: #0 C:\xampp\htdocs\e-service\bookconsis\pages\subject_field.php(104): mysqli_query(Object(mysqli), 'select b.Bib_ID...') #1 {main} thrown in C:\xampp\htdocs\e-service\bookconsis\pages\subject_field.php on line 104