在SQL中使用分區

Question

我遇到查詢問題。這是查詢。

SELECT UserID, MAX(UserName) as UserName, MAX(TransactionTime) as TransactionTime,   MAX(LastAction) as LastAction 
FROM UserActivities 
WHERE OrganizationID = 26465 
GROUP BY UserID 

有在不同TRANSACTIONTIME特定用戶這麼多條記錄。 我想將LastAction和其他記錄一起使用。 我該怎麼辦？ SQL分區會在這裏工作嗎？

Answer 1

一個ranking function可能是你在找什麼：

SELECT * 
FROM (
    SELECT UserID, UserName, LastAction, row_number() over(partition by UserId order by TransactionTime desc) RowNo 
    FROM UserActivities 
    WHERE OrganizationID = 26465 
) t 
where t.RowNo = 1