Count Distinct and extract Values not in Group By - sql

Question

I am trying to get a full table with an additional column with a count distinct grouped by only a set of fields, not the full table.
Basically, I have this table:
| mandt | ktopl | yhkonto | yhhykto | yhbwkz |
|-------|-------|------------|---------|--------|
| 111 | SAG | 0034600000 | 346 | 1 |
| 111 | SAG | 0034600000 | 346 | 21 |
| 111 | SAG | 0034600000 | 346 | 82 |
| 111 | SAG | 0034600000 | 346 | 87 |
| 111 | SAG | 0039410000 | 39410 | 1 |
| 111 | SAG | 0039410000 | 39410 | 21 |
| 111 | SAG | 0039410000 | 39410 | 82 |
| 111 | SAG | 0039410000 | 39410 | 87 |
| 111 | SAG | 0039630000 | 39630 | 1 |
| 111 | SAG | 0039630000 | 39630 | 21 |
and I want to get this result, with an additional column, where I get the count of distinct values of yhhykto grouping by mandt, ktopl and yhkonto:
| mandt | ktopl | yhkonto | yhhykto | yhbwkz | cnt_yhhykto |
|-------|-------|------------|---------|--------|-------------|
| 111 | SAG | 0034600000 | 346 | 1 | 1 |
| 111 | SAG | 0034600000 | 346 | 21 | 1 |
| 111 | SAG | 0034600000 | 346 | 82 | 1 |
| 111 | SAG | 0034600000 | 346 | 87 | 1 |
| 111 | SAG | 0039410000 | 39410 | 1 | 1 |
| 111 | SAG | 0039410000 | 39410 | 21 | 1 |
| 111 | SAG | 0039410000 | 39410 | 82 | 1 |
| 111 | SAG | 0039410000 | 39410 | 87 | 1 |
| 111 | SAG | 0039630000 | 39630 | 1 | 1 |
| 111 | SAG | 0039630000 | 39630 | 21 | 1 |
I have a working query:
select distinct yh010.mandt,
yh010.ktopl,
yh010.yhkonto,
yh010.yhhykto,
yh010.yhbwkz,
yh010_x.cnt_yhhykto
from yh010
inner join (
select distinct yh010.mandt,
yh010.ktopl,
yh010.yhkonto,
count(distinct yh010.yhhykto) as cnt_yhhykto
from yh010
group by yh010.mandt, yh010.ktopl, yh010.yhkonto
) yh010_x
on yh010_x.mandt = yh010.mandt
and yh010_x.ktopl = yh010.ktopl
and yh010_x.yhkonto = yh010.yhkonto
;
But this inner join with itself doesn't seem the best solution. Or is it?
I was thinking more like in terms of:
select yh010.mandt,
yh010.ktopl,
yh010.yhkonto,
yh010.yhhykto,
yh010.yhbwkz
count( distinct yh010.yhhykto
) over ( group by yh010.mandt, yh010.ktopl, yh010.yhkonto
) as cnt_dist
from yh010
;
But Incorrect syntax near the keyword 'distinct'.
Should I keep that working query or is there any better option?
The fiddle can be found here
Thank you!

Answer 1

Based on this description:
I want to get this result, getting the count of distinct values of
yhhykto grouping by mandt, ktopl and yhkonto
You want this query:
select y.mandt, y.ktopl, y.yhkonto,
count(distinct y.yhhykto)
from yh010 y
group by y.mandt, y.ktopl, y.yhkonto;
Your actual results and resulting query don't match the description, leaving me a bit confused.

Answer 2

Antonio,
Could you please test following SELECT statement with CTE expression
with cte as (
select
distinct mandt, ktopl, yhkonto, yhhykto
from TBL1
)
select
TBL1.*, (
select count(cte.yhhykto)
from cte
where
TBL1.mandt = cte.mandt and
TBL1.ktopl = cte.ktopl and
TBL1.yhkonto = cte.yhkonto
) as cnt
from TBL1