创建表中的MySQL错误＃1064

Question

这是我要创建的两个表的SQL：

CREATE TABLE IF NOT EXISTS tbl_a(
    id INT(6) UNSIGNED NOT NULL,
    PRIMARY KEY(id)
)ENGINE = INNODB;

CREATE TABLE IF NOT EXISTS tbl_b(
    id INT(6) UNSIGNED NOT NULL,
    PRIMARY KEY(id),
    FOREIGN KEY id REFERENCES tbl_a(id) ON DELETE CASCADE ON UPDATE CASCADE
)ENGINE = INNODB;

这是我得到的错误：

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 'REFERENCES a(id) ON DELETE CASCADE ON UPDATE CASCADE )ENGINE = INNODB' at line 4

有人可以建议我一个解决方案吗？

Answer 1

在键名周围添加()

CREATE TABLE IF NOT EXISTS tbl_b(
    id INT(6) UNSIGNED NOT NULL,
    PRIMARY KEY(id),
    FOREIGN KEY (id) REFERENCES tbl_a(id) ON DELETE CASCADE ON UPDATE CASCADE
)ENGINE = INNODB;