prepare("
SELECT DISTINCT c.Course_ID, c.Course_Name
FROM Course_Group_Schedule_Main s
JOIN Courses c ON s.Course_ID = c.Course_ID
WHERE s.Group_ID = ?
");
$stmt->bind_param("i", $groupID);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($course = $result->fetch_assoc()) {
echo "