MySQL：无法使用外键创建表

Question

到目前为止，它只创建了前 3 个表： employee 、 skill 、 client

CREATE SCHEMA IF NOT EXISTS my_db;

USE my_db;

CREATE TABLE IF NOT EXISTS employee(
    id INT UNSIGNED AUTO_INCREMENT,
    first_name VARCHAR(255) NOT NULL,
    last_name VARCHAR(255) NOT NULL,
    position VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL,
    PRIMARY KEY(id)
)ENGINE=INNODB;

CREATE TABLE IF NOT EXISTS skill(
    code VARCHAR(255),
    description VARCHAR(255),
    PRIMARY KEY(code)
)ENGINE=INNODB;

CREATE TABLE IF NOT EXISTS client(
    code VARCHAR(255),
    description VARCHAR(255),
    PRIMARY KEY(code)
)ENGINE=INNODB;

CREATE TABLE IF NOT EXISTS project(
    code VARCHAR(255),
    role VARCHAR(255) NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    description VARCHAR(255),
    client.code VARCHAR(255),
    PRIMARY KEY(code),
    FOREIGN KEY(client.code) REFERENCES client(code),
    ON DELETE CASCADE
    ON UPDATE CASCADE
)ENGINE=INNODB;

CREATE TABLE IF NOT EXISTS responsibility(
    id INT UNSIGNED AUTO_INCREMENT,
    description VARCHAR(255) NOT NULL,
    project.code VARCHAR(255),
    PRIMARY KEY(id),
    FOREIGN KEY(project.code) REFERENCES project(code),
    ON DELETE CASCADE
    ON UPDATE CASCADE
)ENGINE=INNODB;

/* Junction Table */
CREATE TABLE IF NOT EXISTS employee_skill(
    employee.id VARCHAR(255),
    skill.code VARCHAR(255),
    PRIMARY KEY(employee.id, skill.code),
    FOREIGN KEY(employee.id) REFERENCES employee(id),
    FOREIGN KEY(skill.code) REFERENCES skill(code)
    ON DELETE CASCADE
    ON UPDATE CASCADE
)ENGINE=INNODB;

/* Junction Table */
CREATE TABLE IF NOT EXISTS employee_client(
    employee.id VARCHAR(255),
    client.code VARCHAR(255),
    PRIMARY KEY(employee.id, client.code),
    FOREIGN KEY(employee.id) REFERENCES employee(id),
    FOREIGN KEY(client.code) REFERENCES client(code)
    ON DELETE CASCADE
    ON UPDATE CASCADE
)ENGINE=INNODB;

并在使用外键（即project ）命中第一个表时停止

然后抛出这个错误：

#1103 - Incorrect table name 'client'

Answer 1

项目表中的列名client.code导致中断，因为已经有一个名为client的表。

您必须在反引号中使用列名，例如：

`client.code`

我建议改用下划线并将其作为client_code以完全避免句点。

Answer 2

CREATE TABLE IF NOT EXISTS project(
    code VARCHAR(255),
    role VARCHAR(255) NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    description VARCHAR(255),
    client_code VARCHAR(255),
    PRIMARY KEY(code),
    FOREIGN KEY(client_code) REFERENCES client(code)
    ON DELETE CASCADE
    ON UPDATE CASCADE
)ENGINE=INNODB;

删除逗号（，）并更改您的client. to client_code enjoy(',')