1.首先，在命令行中啟動MySQL服務；

service mysql start　　

2.MySQL服務啟動后，在命令行中輸入mysql的用戶名和密碼登錄到MySQL；

mysql -u root -p

3.登錄到MySQL后，選擇使用一個數據庫；

use mysql;

4.最后，進入到數據庫后，在數據庫進行新建一個表；

CREATE TABLE user_orders (orders_id INT UNSIGNED NOT NULL ,
user_id INT UNSIGNED NOT NULL ,
add_time INT UNSIGNED NOT NULL ,
PRIMARY KEY (orders_id),
KEY (user_id),
KEY (add_time)
)ENGINE=INNODB DEFAULT CHARSET utf8;

5.數據表創建好后，向表中插入數據；

INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '1' , '1' , '1' );
INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '2' , '1' , '2' );
INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '3' , '1' , '3' );
INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '4' , '2' , '1' );
INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '5' , '2' , '2' );
INSERT INTO `user_orders` (`orders_id`, `user_id`, `add_time`) VALUES ( '6' , '2' , '3' );

6.最后，數據插入后，執行以下命令即可對表中的數據進行分組排序；

SELECT orders_id,user_id,add_time,rank FROM (
SELECT @rownum:=@rownum+1 AS rownum,
IF(@x=uo.user_id,@rank:=@rank+1,@rank:=1) rank,
@x:=uo.user_id, 
orders_id,user_id,add_time 
FROM 
user_orders uo,
( SELECT @rownum:=0,@rank:=0) init 
ORDER BY user_id ASC , add_time DESC
)result
WHERE rank=2