如何使用滯後函數

Question

一直試圖用下面的查詢找到在SQL Server同一列的連續行之間的差別，但我越來越常數差

with cte as 
(
select businessentityid,nationalidnumber,SickLeaveHours,LAG(sickleavehours) over (order by businessentityid) as PreviousRow 
from HumanResources.Employee 
) 
select *,DIFFERENCE(sickleavehours,cte.previousrow) from cte 

Answer 1

你能不能做到這一點？ ：

with cte as 
(
select businessentityid,nationalidnumber,SickLeaveHours,LAG(sickleavehours) over (order by businessentityid) as PreviousRow 
from HumanResources.Employee 
) 
select *, sickleavehours - cte.previousrow as difference from cte