PHP MySQL 스크립트에서 예약어가 포함된 테이블을 생성할 때 구문 오류가 발생하는 이유는 무엇입니까?

<code class="language-php">$sql = "CREATE TABLE `user` (
    user_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ...
)";

$sql2 = "CREATE TABLE `order` (
    order_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    user_id INT UNSIGNED NOT NULL,
    ...
    FOREIGN KEY (user_id) REFERENCES `user` (user_id)
)";</code>

<code>Error creating table: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'order( order_id INT UNSIGNED NOT NULL AUTO_INCREMENT, user_id ' at line 1</code>

<code class="language-php">$sql2 = "CREATE TABLE `order` (
    order_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    user_id INT UNSIGNED NOT NULL,
    ...
    FOREIGN KEY (user_id) REFERENCES `user` (user_id)
)";</code>