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Developer-C 11.1
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with tab_a(sub_id, amount) as ( select 1, 10 from dual union all select 2, 5 from dual union all select 3, 7 from dual union all select 4, 15 from dual union all select 5, 4 from dual ), tab_b(slab_number, slab_start, slab_end) as ( select 1, 12, 20 from dual union all select 2, 21, 25 from dual union all select 3, 26, 35 from dual ), a as ( select sub_id, row_number() over (order by sub_id) rn, sum(amount) over (order by sub_id) rs from tab_a), b as (select tab_b.*, max(slab_number) over () msn from tab_b ) select sub_id, rs, case when sn is null and row_number() over (partition by sn order by sub_id) = 1 then msn else sn end sn from ( select sub_id, rs, max(msn) over () msn, case when slab_number is null and rn = 1 then 0 else slab_number end sn from a left join b on rs between slab_start and slab_end)
SUB_ID
RS
SN
1
10
0
2
15
1
3
22
2
4
37
3
5
41
null