无法使用日期功能获得结果

Question

我想使用查询检查条件

select min(date_format(date(time_stamp),'%Y-%m-%d'))as time_stamp,
       'FN' period,
       null count  ,
       null sheetno,
       if (count(min(date_format(date(time_stamp),'%Y-%m-%d')))=1 ,200,0) as amount  
from omr_verification

我想计算time_stamp是否可用，意味着数量= 200，否则为0

Answer 1

可以使用if条件或case进行选择。

select min(date_format(date(time_stamp),'%Y-%m-%d'))as time_stamp,
   'FN' period,
   null count  ,
   null sheetno,
   if (time_stamp !='' ,200,0) as amount  from omr_verification