Update field taking value from previous row

Question

I have a table TEST (ID int, name varchar(20), amount decimal(18,0)).
First row of the table have correct value. I want to update amount column except first row by adding 10 with the previous row value without using cursor.
id    Name    Amount
1    abc    10
2    def    15
3    ghi    20
4    jkl    22
5    mno    25
6    pqr    27
7    stu    30
8    vwx    33
id    Name    Amount
1    abc    10
2    def    20
3    ghi    30
4    jkl    40
5    mno    50
6    pqr    60
7    stu    70
8    vwx    80
please help me.
thanks
srimanta manna

Answer 1

create table #t (id int, amount int)
insert into #t values (1,10)
insert into #t values (2,25)
insert into #t values (3,46)
insert into #t values (4,55)
insert into #t values (5,160)
insert into #t values (6,89)
insert into #t values (7,100)
with cte
as
select *,(select min(amount) from #t t where t.id=1) as a
FROM #t 
) update #t set amount=(select sum(a) from cte c where c.id<=cte.id) 
 from cte where #t.id=cte.id
 select * from #t
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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