mysql - 借助 sql 更新具有不同 refno 的 new_status 列

Question

   datetime                 refno      status      final_status
----------------------------------------------------------------
   2016-12-01 10:00:00      123456     hold
   2016-12-02 11:10:00      123456     delivered 
   2016-12-01 10:00:00      654321     hold
   2016-12-02 12:20:00      654321     delivered 
   2016-12-01 10:00:00      111111     hold
   2016-12-01 01:00:00      222222     hold

如果 Refno 已交付，我想区分 refno，然后 new_status 列将更新为已交付，否则更新为 hold

喜欢这种类型:-

输出:-

   datetime                 refno      status      final_status
  ----------------------------------------------------------------
   2016-12-01 10:00:00      123456     hold        delivered 
   2016-12-01 10:00:00      654321     hold        delivered 
   2016-12-01 10:00:00      111111     hold        hold
   2016-12-01 01:00:00      222222     hold        hold

Answer 1

如果下面的 status 列中只有 hold 和 delivered 值，则对您有用。

select
  min(datetime),
  refno,
  max(status) status,
  min(status) final_status
from
  my_table
group by
  refno;