mysql查询表结构语句

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    email VARCHAR(100) NOT NULL UNIQUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

DESC users;

+----------+-------------+------+-----+-------------------+----------------+
| Field    | Type        | Null | Key | Default           | Extra          |
+----------+-------------+------+-----+-------------------+----------------+
| id       | int         | NO   | PRI | NULL              | auto_increment |
| username | varchar(50) | NO   |     | NULL              |                |
| email    | varchar(100)| NO   | UNI | NULL              |                |
| created_at | timestamp   | NO   |     | CURRENT_TIMESTAMP |                |
+----------+-------------+------+-----+-------------------+----------------+

SHOW CREATE TABLE users;

CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) NOT NULL,
  `email` varchar(100) NOT NULL,
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;