minor - fixed ambigous field for session inside sql query

main/admin/session_course_edit.php

@@ -37,7 +37,7 @@ $interbreadcrumb[]=array('url' => "session_list.php","name" => get_lang("Session
 $interbreadcrumb[]=array('url' => "../admin/resume_session.php?id_session=".Security::remove_XSS($_REQUEST['id_session']),"name" => get_lang('SessionOverview'));
 $interbreadcrumb[]=array('url' => "session_course_list.php?id_session=$id_session","name" =>api_htmlentities($session_name,ENT_QUOTES,$charset));
 
-$result=Database::query("SELECT name,title FROM $tbl_session_course,$tbl_session,$tbl_course WHERE id_session=id AND course_code=code AND id_session='$id_session' AND course_code='".addslashes($course_code)."'",__FILE__,__LINE__);
+$result = Database::query("SELECT s.name, c.title FROM $tbl_session_course sc,$tbl_session s,$tbl_course c WHERE sc.id_session=s.id AND sc.course_code=c.code AND sc.id_session='$id_session' AND sc.course_code='".addslashes($course_code)."'",__FILE__,__LINE__);
 
 if (!list($session_name,$course_title)=Database::fetch_row($result)) {
 	header('Location: session_course_list.php?id_session='.$id_session);