Sql 基于截止日期和上一行获取行

我得到了以下示例数据，我试图根据DateChanged值从链接表和前一行中获取适当的数据量

结果将显示为

这怎么可能呢？到目前为止，我只知道这一点，但我想知道还有更好的方法吗

 select
    *
from 
    #temp t
Inner Join 
(
    select 
        TempID,
        Amount,
        StartDate,
        isnull(EndDate, getdate()) as EndDate,
        LAG(Amount, 1)  OVER(partition by TempID ORDER BY row_num)  PrevValue2,
        LEAD(Amount, 1) OVER(partition by TempID ORDER BY row_num)  NextValue2
    from 
    (
      SELECT ROW_NUMBER() OVER (partition by TempID Order by TempID) row_num,
             TempAmountsID,
             TempID,
             StartDate,
             EndDate,
             Amount
      FROM   #tempAmounts
    ) t1
) t2 on 
    t.TempID = t2.TempID and
    t.DateChanged between t2.StartDate and t2.EndDate

---

这适用于提供的示例：

select a.*, b.amount , c.amount as previousamount
from #temp a
left join #tempamounts b on a.tempid = b.tempid 
       and b.startdate = (select max(startdate) from #tempamounts 
          where tempid = a.tempid and startdate < a.datechanged)
left join #tempamounts c on a.tempid = c.tempid
      and c.startdate = (select max(startdate) from #tempamounts 
          where tempid = a.tempid and startdate < b.startdate) 

---

这适用于提供的示例：

select a.*, b.amount , c.amount as previousamount
from #temp a
left join #tempamounts b on a.tempid = b.tempid 
       and b.startdate = (select max(startdate) from #tempamounts 
          where tempid = a.tempid and startdate < a.datechanged)
left join #tempamounts c on a.tempid = c.tempid
      and c.startdate = (select max(startdate) from #tempamounts 
          where tempid = a.tempid and startdate < b.startdate) 

只需使用lag和join：

只需使用lag和join：

---

1请不要使用图像作为数据。2.请出示您的护照attempt@DaleK，当然，谢谢，已添加尝试。我想显示我所指的数据，而不仅仅是sql命令。是的，您可以将数据显示为格式化文本，占用更少的空间，更易于阅读。1请不要将图像用于数据。2.请出示您的护照attempt@DaleK，当然，谢谢，已添加尝试。我想显示我所指的数据，而不仅仅是sql命令。是的，您可以将数据显示为格式化文本，占用更少的空间，更易于阅读。

select t.*, ta.amount, ta.prev_amount
from #temp t left join
     (select ta.*,
             lag(ta.amount) over (partition by ta.tempid order by ta.startdate) as prev_amount
      from #tempAmounts ta
     ) ta
     on t.tempid = ta.tempid and
        t.datechanged >= ta.startdate and
        (t.datechanged <= ta.enddate or ta.enddate is null);