如果分钟高于15分钟，则在sql中创建一列

Question

我希望在以下代码中的分钟（LT Min）超过15分钟时创建一列

select TIMESTAMPDIFF(MINUTE, cs.subscribeddate,cs.unsubscribeddate) as 'LT Min'
from customer cs 

有什么想法吗？我应该使用IF吗？

Answer 1

您已经展示了如何在几分钟内获得差异。现在要么用它来限制选定的记录，例如：

select cs.*, TIMESTAMPDIFF(MINUTE, cs.subscribeddate,cs.unsubscribeddate) as "LT Min"
from customer cs 
where TIMESTAMPDIFF(MINUTE, cs.subscribeddate, cs.unsubscribeddate) > 15;

或选择所有行并仅在高于15时显示差异：

select cs.*, 
  case when TIMESTAMPDIFF(MINUTE, cs.subscribeddate, cs.unsubscribeddate) > 15 then 
    TIMESTAMPDIFF(MINUTE, cs.subscribeddate, cs.unsubscribeddate)
  end as "LT Min"
from customer cs;