用不同的值替换也用作外键的主键

Question

我当前的数据库架构如下所示。

CREATE TABLE IF NOT EXISTS w4a_authentication_data (
    login_id VARCHAR(100) NOT NULL,
    password VARCHAR(150) NOT NULL,
    PRIMARY KEY (login_id)
);

CREATE TABLE IF NOT EXISTS w4a_user (
    id INTEGER NOT NULL AUTO_INCREMENT,
    login_id VARCHAR(100) NOT NULL UNIQUE,
    first_name VARCHAR(100),
    last_name VARCHAR(100),
    division INTEGER NOT NULL,
    created_date TIMESTAMP NOT NULL,
    last_active DATE,
    PRIMARY KEY (id), 
    FOREIGN KEY (login_id) REFERENCES w4a_authentication_data (login_id) ON DELETE RESTRICT,
    FOREIGN KEY (division) REFERENCES w4a_division (id) ON DELETE RESTRICT
);

CREATE TABLE IF NOT EXISTS w4a_contact_number(
    contact_number VARCHAR(10) NOT NULL,
    user_id INTEGER NOT NULL,
    is_confirmed BOOLEAN NOT NULL DEFAULT FALSE,
    PRIMARY KEY (contact_number),
    FOREIGN KEY (user_id) REFERENCES w4a_user (id) ON DELETE CASCADE 
);

我的数据库目前有所有这些 table 中的数据。现在我需要用从 w4a_contact_number table 中选择的特定用户的联系电话号码替换用于登录 ID 的值。我该怎么做？

Answer 1

为此，您需要更改链接 w4a_user 至 w4a_authentication_data 的外键定义以添加 ON UPDATE CASCADE 选项：

FOREIGN KEY (login_id) 
    REFERENCES w4a_authentication_data (login_id) 
    ON DELETE RESTRICT
    ON UPDATE CASCADE

然后，您可以使用 update ... join 语法：

update w4a_authentication_data ad 
inner join w4a_user u on u.login_id = ad.login_id
inner join w4a_contact_number cn on cn.user_id = u.id
set ad.login_id = cn.contact_number

数据库跟踪修改的值并相应地更新依赖列。

Demo on DB Fiddle

用不同的值替换也用作外键的主键

Replace primary key, which is also used as a foreign key, with a different value

mysql

sql

foreign-keys

primary-key

sql-update