我尝试使用 MAX 函数解决这个问题,但得到了结果。有没有办法通过使用任何其他功能来解决它?
I tried solving this problem by using MAX function but get the result . Is there a way to solve it by using any other function?
我需要为每个订单获取“第二个 updated_time”,并按“update_time”对它们进行排序。我写了以下查询,它没有给出任何输出。
假设,如果我们在 update_time 上对 table 进行排序(同样的问题,但是扩展)
服务器是 Mysql。将应用 TIMEDIFF() 函数,但如何应用?它正在尝试:
select order_history.,order_history.TIMEDIFF(
来自 (select order_history.,
row_number() OVER(按 order_id 分区,按 update_time 排序)作为 seqnum
来自 order_history
) order_history
其中序号 = 2
按 update_time;
排序
select update_time
排序
[附图显示orders_history(table为问题)]
I need to get "second updated_time" for each order and sorting them by "update_time".
这听起来像:
select oh.*
from (select oh.*,
row_number() over (partition by order_id order by update_toime) as seqnum
from order_history oh
) oh
where seqnum = 2
order by update_time;
我需要为每个订单获取“第二个 updated_time”,并按“update_time”对它们进行排序。我写了以下查询,它没有给出任何输出。
假设,如果我们在 update_time 上对 table 进行排序(同样的问题,但是扩展) 服务器是 Mysql。将应用 TIMEDIFF() 函数,但如何应用?它正在尝试:
select order_history.,order_history.TIMEDIFF( 来自 (select order_history., row_number() OVER(按 order_id 分区,按 update_time 排序)作为 seqnum 来自 order_history ) order_history 其中序号 = 2 按 update_time;
排序select update_time
[附图显示orders_history(table为问题)]
I need to get "second updated_time" for each order and sorting them by "update_time".
这听起来像:
select oh.*
from (select oh.*,
row_number() over (partition by order_id order by update_toime) as seqnum
from order_history oh
) oh
where seqnum = 2
order by update_time;