在服务器中,能否在没有使用LEAD的情况下从另一行获得分量的价值? 根据概述条款的顺序,我的数据没有按字母顺序保证,因此我不能依靠LEAD。
create table #dt(ID int,C Char(1), W char(1), R decimal(18,5))
go
insert into #dt(ID,C,W,R) values
(1, E , A ,0.6),(1, A , B ,0.55)
go
select
ID,C,W,R
--cannot rely on LEAD
,LEAD(R) over(partition by ID order by W) as LEAD_
from #dt
Yes, by using a (self-) join. As it s said here https://learn.microsoft.com/en-us/sql/t-sql/functions/lead-transact-sql?view=sql-server-ver16 : LEAD was introduced to do self-join like operations without using a self-join.
General example of self-join:
SELECT dt1.id, dt1.c, dt1.w, dt1.r, dt2.c, dt2.w, dt2.r
FROM dt AS dt1
JOIN dt AS dt2 ON dt2.id = dt1.id
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