二手房中介管理系统mysql代码

下面是一个简单的二手房中介管理系统MySQL代码示例，包括创建数据库和表结构以及一些基本的SQL语句：

创建数据库：

CREATE DATABASE estate_management;

创建表结构：

CREATE TABLE houses (
  id INT(11) NOT NULL AUTO_INCREMENT,
  title VARCHAR(255) NOT NULL,
  description TEXT,
  price DECIMAL(10, 2) NOT NULL,
  location VARCHAR(255) NOT NULL,
  agent_id INT(11) NOT NULL,
  PRIMARY KEY (id),
  FOREIGN KEY (agent_id) REFERENCES agents(id)
);

CREATE TABLE clients (
  id INT(11) NOT NULL AUTO_INCREMENT,
  name VARCHAR(255) NOT NULL,
  email VARCHAR(255) NOT NULL,
  phone VARCHAR(20) NOT NULL,
  PRIMARY KEY (id)
);

CREATE TABLE agents (
  id INT(11) NOT NULL AUTO_INCREMENT,
  name VARCHAR(255) NOT NULL,
  email VARCHAR(255) NOT NULL,
  phone VARCHAR(20) NOT NULL,
  company VARCHAR(255) NOT NULL,
  PRIMARY KEY (id)
);

插入数据：

INSERT INTO houses (title, description, price, location, agent_id)
VALUES ('Beautiful apartment', 'A spacious and modern apartment in a prime location', 200000, 'New York', 1);

INSERT INTO clients (name, email, phone)
VALUES ('John Smith', 'john.smith@example.com', '555-1234');

INSERT INTO agents (name, email, phone, company)
VALUES ('Jane Doe', 'jane.doe@example.com', '555-5678', 'ABC Realty');

查询数据：

SELECT * FROM houses WHERE location = 'New York';

SELECT * FROM clients WHERE email = 'john.smith@example.com';

SELECT * FROM agents WHERE company = 'ABC Realty';

更新数据：

UPDATE houses SET price = 220000 WHERE id = 1;

UPDATE clients SET phone = '555-4321' WHERE id = 1;

UPDATE agents SET company = 'XYZ Realty' WHERE id = 1;

删除数据：

DELETE FROM houses WHERE id = 1;

DELETE FROM clients WHERE id = 1;

DELETE FROM agents WHERE id = 1;

请注意，以上代码只是示例，实际情况下需要根据具体需求进行调整。同时，为了确保数据安全性，还需要进行适当的数据备份和恢复操作。