Question

＃1005 - 无法创建表'ass1 lol.management'（错误号码：150）（详情......）

当我尝试创建多个到多个表时，我发现了上面的错误

尝试在员工和主管之间创建多对多的表，当我创建主管和员工表时，不会返回错误。但是当我去创建我的管理表时，我得到了上述错误。

这些是我的创建表语句

员工表

CREATE TABLE IF NOT EXISTS employee (

    emp_id INT(4) NOT NULL,
    yr_ser INT(4),
    status VARCHAR(30),
    emp_name VARCHAR(30),
    emp_gen VARCHAR(1),
    PRIMARY KEY (emp_id)
);

主管表

CREATE TABLE IF NOT EXISTS supervisor (
    sup_id INT(4) NOT NULL,
    sup_name VARCHAR(30) NOT NULL,
    gen INT(4),
    dep_id INT(4),

    PRIMARY KEY (sup_id),
    INDEX (dep_id),

    FOREIGN KEY (dep_id)
        REFERENCES department(dep_id)
        ON UPDATE CASCADE ON DELETE RESTRICT    
);

但是当我去创建此表时，我收到错误

管理表

CREATE TABLE IF NOT EXISTS management (
    emp_id INT(4) NOT NULL,
    sup_id INT(4) NOT NULL,

    PRIMARY KEY (emp_id, sup_id),
    INDEX (emp_id),
    INDEX (sup_id),

    FOREIGN KEY (emp_id)
        REFERENCES employee(emp_id)
        ON UPDATE CASCADE ON DELETE RESTRICT,

    FOREIGN KEY (sup_id)
        REFERENCES supervisor(act_id)
        ON UPDATE CASCADE ON DELETE RESTRICT
);

帮助将不胜感激，谢谢。

Answer 1

您的may-to-many表引用act_id表中的字段supervisor，但未定义此字段。应改为sup_id：

CREATE TABLE IF NOT EXISTS management (
emp_id INT(4) NOT NULL,
sup_id INT(4) NOT NULL,

PRIMARY KEY (emp_id, sup_id),
INDEX (emp_id),
INDEX (sup_id),

FOREIGN KEY (emp_id)
    REFERENCES employee(emp_id)
    ON UPDATE CASCADE ON DELETE RESTRICT,

FOREIGN KEY (sup_id)
    REFERENCES supervisor(sup_id) -- Here
    ON UPDATE CASCADE ON DELETE RESTRICT
);

SQL - 许多表不会工作

1 个答案: