<div>
                <label>Vyber predmet:</label>
            <?php
            $sql2 = "SELECT nazov FROM predmet";
            $result2 = $conn->query($sql2);
            echo "<select name='predmety' class='form-control' required>";
            if ($result2->num_rows > 0) {
                while($row = $result2->fetch_assoc()) {
                    echo "<option>".$row["nazov"]."</option>";
                }
            } else {
                echo "0 results";
            }
            echo "</select>";
            ?>
        </div>