使列在SQL如果分鐘數高於15分鐘

Question

我想打一列時分秒（LT Min）高於15分鐘以下代碼

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

任何想法？我應該使用IF嗎？

Answer 1

您已經顯示瞭如何在幾分鐘內獲得差異。現在，無論是用它來限制選定的記錄，e.g：

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

，或者選擇所有行和示區別，只有當它是高於15：

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;