選擇最大日期，然後在WHERE子句中使用它

Question

我確信有一個簡單的解決方案，但我正在試圖弄清楚它在我的腦海裏。有時候，額外的眼睛可以節省一天的時間！

SELECT S.StoreId, MAX(AL.ActivityDate) AS LastActivity FROM Stores S 
INNER JOIN dbo.ActivityLog AL ON AL.StoreID = S.StoreID 
WHERE S.StoreID IN (SELECT StoreID FROM Stores WHERE Status = 2) 
AND AL.ActivityDate < DATEADD(DAY, -180, GETDATE()) 
GROUP BY S.StoreID 
ORDER BY LastActivity 

我的目標：拉出所有MAX活動日期大於6個月（180天）的商店。這一點代碼似乎沒有做到這一點...任何想法？

謝謝！

Answer 1

我認爲你可以做你想要group by和having什麼：

select al.StoreId, MAX(al.ActivityDate) AS LastActivity 
from dbo.ActivityLog al 
group by al.StoreId 
having MAX(al.ActivityDate) < DATEADD(day, -100, getdate());