prepare("DELETE FROM schedule_course_for_group WHERE Schedule_ID = ? AND Start_Date = ? AND Time_Slot = ?");
$stmt->bind_param("iss", $Schedule_ID, $Start_Date, $Time_Slot);
if ($stmt->execute() && $stmt->affected_rows > 0) {
echo 'deleted';
} else {
echo 'Delete failed or session not found';
}
$stmt->close();