如何在Java规范中添加子查询

import java.sql.*;

public class SubqueryExample {
    public static void main(String[] args) {
        try {
            // 连接到数据库
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 创建查询语句
            String query = "SELECT * FROM customers WHERE age > (SELECT AVG(age) FROM customers)";

            // 创建Statement对象
            Statement statement = connection.createStatement();

            // 执行查询
            ResultSet resultSet = statement.executeQuery(query);

            // 处理结果集
            while (resultSet.next()) {
                // 获取数据
                String name = resultSet.getString("name");
                int age = resultSet.getInt("age");
                String email = resultSet.getString("email");

                // 打印结果
                System.out.println("Name: " + name + ", Age: " + age + ", Email: " + email);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}