为什么我的CREATE TABLE语句不能在没有反勾号的情况下运行?

This query runs:

这个查询:

MariaDB > CREATE TABLE `lines` (`line_id` INT UNSIGNED AUTO_INCREMENT,
    -> `page_id` int(10) UNSIGNED NOT NULL,
    -> `file_name` varchar(150) NOT NULL,
    -> `position` varchar(20) NOT NULL,
    -> PRIMARY KEY(line_id),
    -> FOREIGN KEY(page_id) REFERENCES pages(page_id)
    ->     ON DELETE CASCADE
    -> )AUTO_INCREMENT=100;
Query OK, 0 rows affected (0.01 sec)
MariaDB > CREATE TAB