mysql用视图连接两个表

-- 创建 employees 表
CREATE TABLE employees (
    id INT PRIMARY KEY,
    name VARCHAR(100),
    department_id INT
);

-- 创建 departments 表
CREATE TABLE departments (
    id INT PRIMARY KEY,
    name VARCHAR(100)
);

-- 插入示例数据
INSERT INTO employees (id, name, department_id) VALUES (1, 'Alice', 1);
INSERT INTO employees (id, name, department_id) VALUES (2, 'Bob', 2);
INSERT INTO departments (id, name) VALUES (1, 'HR');
INSERT INTO departments (id, name) VALUES (2, 'Engineering');

-- 创建视图连接两个表
CREATE VIEW employee_department AS
SELECT e.id, e.name AS employee_name, d.name AS department_name
FROM employees e
JOIN departments d ON e.department_id = d.id;

-- 在 employees 表的 department_id 字段上创建索引
CREATE INDEX idx_department_id ON employees(department_id);

-- 创建可更新的视图
CREATE VIEW employee_department_updatable AS
SELECT e.id, e.name AS employee_name, d.name AS department_name
FROM employees e
JOIN departments d ON e.department_id = d.id
WITH CHECK OPTION;