Assignation counting up to maximum - sql

Question

I have the below 2 tables:
aux1:
PC
A
MAXI
PC1
A1
1
PC1
A2
2
PC2
A1
1
PC2
A2
2
aux:
VK
D
PC
VK1
8
PC1
VK2
7
PC1
VK3
6
PC2
VK4
5
PC2
VK5
4
PC1
VK6
3
PC1
VK7
2
PC2
VK8
1
PC2
I would like to obtain the following output:
VK
D
PC
A
ORDER_A_PC
ORDER_PC
VK1
8
PC1
A1
1
1
VK2
7
PC1
A2
1
2
VK3
6
PC2
A1
1
1
VK4
5
PC2
A2
1
2
VK5
4
PC1
A2
2
3
VK6
3
PC1
NA
NA
NA
VK7
2
PC2
A2
2
3
VK8
1
PC2
NA
NA
NA
The logic for the columns is:
A: ordering aux by D desc and partitioning by PC, assign A (A1 or A2) until the count over partition reaches the maxi configured in table aux1 for each PC and A.
ORDER_A_PC: ordered count over partition by A and PC until the count exceeds the maxi for that PC, A in table aux1
ORDER_PC: same as ORDER_A_PC but partitioned by just PC.
with aux (vk, pc) as (
select 'VK1', 'PC1' from dual union all
select 'VK2', 'PC1' from dual union all
select 'VK3', 'PC2' from dual union all
select 'VK4', 'PC2' from dual union all
select 'VK5', 'PC1' from dual union all
select 'VK6', 'PC1' from dual union all
select 'VK7', 'PC2' from dual union all
select 'VK8', 'PC2' from dual),
aux1 (pc, a, maxi) as (
select 'PC1', 'A1', 1 from dual union all
select 'PC1', 'A2', 2 from dual union all
select 'PC2', 'A1', 1 from dual union all
select 'PC2', 'A2', 2 from dual)
select * from aux

Answer 1

Nice little problem. You can distribute the assets preprocessing the ranges and then joining by range.
For example, you can do:
with aux (vk, pc) as (
select 'VK1', 'PC1' from dual union all
select 'VK2', 'PC1' from dual union all
select 'VK3', 'PC2' from dual union all
select 'VK4', 'PC2' from dual union all
select 'VK5', 'PC1' from dual union all
select 'VK6', 'PC1' from dual union all
select 'VK7', 'PC2' from dual union all
select 'VK8', 'PC2' from dual),
aux1 (pc, a, maxi) as (
select 'PC1', 'A1', 1 from dual union all
select 'PC1', 'A2', 2 from dual union all
select 'PC2', 'A1', 1 from dual union all
select 'PC2', 'A2', 2 from dual),
s as (
select a.*,
coalesce(sum(maxi) over(partition by pc order by pc, a
rows between unbounded preceding and 1 preceding), 0) + 1 as first_maxi,
sum(maxi) over(partition by pc order by pc, a) as last_maxi
from aux1 a
),
x as (
select a.*,
row_number() over(order by vk) as rn
from aux a
),
y as (
select a.*,
(select count(*) from x b where b.rn <= a.rn and b.pc = a.pc) as cnt
from x a
)
select
y.vk, y.pc, s.a,
case when s.pc is not null then row_number()
over(partition by y.pc, s.a order by y.rn) end as order_a_pc,
case when s.pc is not null then row_number()
over(partition by y.pc order by y.rn) end as order_pc
from y
left join s on s.pc = y.pc and y.cnt between s.first_maxi and s.last_maxi
order by y.rn
Result:
VK PC A ORDER_A_PC ORDER_PC
--- --- ------ ---------- --------
VK1 PC1 A1 1 1
VK2 PC1 A2 1 2
VK3 PC2 A1 1 1
VK4 PC2 A2 1 2
VK5 PC1 A2 2 3
VK6 PC1 <null> <null> <null>
VK7 PC2 A2 2 3
VK8 PC2 <null> <null> <null>
See running example at db<>fiddle.