要找出在SQL Server上一行的計算值2012

Question

a sql query gives result as shown

我想這是通過從工資中扣除的序列號1和其它串行沒有工資人口將先前計算的行額外的計算列其中應該用於當前行的工資中扣除如上圖下方

populated result would be like this

請幫我找出結果。 thanx提前

Answer 1

在SQL Server 2012+，你可以使用一個累積和加減：

select t.*, 
     (salary - sum(deduct) over (partition by employee order by sn)) as calc 
from t;