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create table test (a int, b int); insert into test (a,b) values (1,null),(2,1),(3,3),(4,null),(5,5),(6,null);
6 rows affected
select a, sum(b) over (order by a, b) as "sum" from test;
a
sum
1
null
2
1
3
4
4
4
5
9
6
9