1.查询指定用户的所有最新的订单信息

数据库表结构
id user_id order_status update_date
0001 admin ORDER_BUILD 2020-06-01
0002 admin ORDER_PAYED 2020-06-02
0003 admin ORDER_DELEVERY 2020-06-03
0004 root ORDER_BUILD 2020-06-01
0005 admin ORDER_ARRIVEL 2020-06-04
查询语句
select * from  
(  
    select * from tc_order   
    where user_id = 'admin'  
) p1  
inner join
(  
    select   
        id, user_id, order_status, max(update_date) UpdateDate
    from tc_order   
    where   
        user_id = 'admin'  
    group by id  
) p2  
     on p1.id = p2.id  
    and p1.update_date = p2.UpdateDate  
where   
    1 = 1  
order by p1.update_date desc
查询结果
id user_id order_status update_date
0004 root ORDER_BUILD 2020-06-01
0005 admin ORDER_ARRIVEL 2020-06-04

参商
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