如何提取基於entrydate sql server的最後記錄

Question

我有很多重複的作業ID，但入境日期不能重複。我需要根據上次登錄日期獲取始終唯一的工作ID。我已經解決了它與下面的查詢，但想知道是否有更好的方式來形成相同的SQL時，數據將是巨大的最佳性能。請指導我謝謝。

SELECT A.JID,A.EntryDate,RefundDate,Comments,Refund, ActionBy 
FROM (
      (
      select JID, Max(EntryDate) AS EntryDate 
      from refundrequested 
      GROUP BY JID 
      ) A 
      Inner JOIN 
      (
        SELECT JID,ENTRYDATE,refundDate,Comments,refund,ActionBy 
        from refundrequested 
      ) B 
      ON A.JID=B.JID AND A.EntryDate = B.EntryDate 
     ) 

Answer 1

使用row_number()功能通常是快了一點：

select * 
from (
     select row_number() over (partition by jid 
            order by EntryDate desc) as rn 
     ,  * 
     from refundrequested 
     ) as SubQueryAlias 
where rn = 1 

Answer 2

查詢：

SELECT t1.JID, 
     t1.EntryDate, 
     t1.RefundDate, 
     t1.Comments, 
     t1.Refund, 
     t1.ActionBy 
FROM refundrequested t1 
LEFT JOIN refundrequested t2 
    ON t2.JID = t1.JID 
    AND t2.EntryDate > t1.EntryDate 
WHERE t2.JID is null