How to display on a certain amount of data for a specific column - sql

Question

Consider the following table
Dept product name parts WO
32 aa abc 11 1234
32 aa aas 18 2213
32 bb asd 16 3424
32 aa adf 19 1255
32 cc asa 10 7567
32 aa agd 11 1233
31 ss fsf 23 3434
I have around 100 dept. in my table. What I want is that when the dept. is 32 and the product is "aa", I only want to display 30 parts or less. So in this case the total number of parts for aa is 59. So the first aa product has 11 parts and the next aa product has 18 parts so that's 29. It should now ignore all the other aa products.
Expected Output
Dept product name parts WO
32 aa abc 11 1234
32 aa aas 18 2213
32 bb asd 16 3424
32 cc asa 10 7567
31 ss fsf 23 3434
Appreciate any help provided.

Answer 1

Assuming WO is a primary key then use SUM window function to solve it.
SELECT yt.Dept, yt.product, yt.name, yt.parts, yt.WO
FROM yourtable yt
LEFT JOIN (
SELECT *, sum(y.parts) over (partition by y.dept order by y.parts) tsum
FROM yourtable y
WHERE y.product = 'aa'
) t ON yt.WO= t.WO
WHERE yt.dept != 32 or (yt.dept = 32 and t.tsum < 59) or (yt.dept = 32 and yt.product != 'aa')

Answer 2

you can use SUM() window function where you have to partition by dept and product
SELECT dept,
product,
name,
parts,
wo
FROM (SELECT *,
SUM(parts) OVER (PARTITION BY dept, product ORDER BY name) rt
FROM t
) t_rt
WHERE rt <= 30
ORDER BY dept DESC,
product,
wo
Result
dept product name parts wo
32 aa abc 11 1234
32 aa aas 18 2213
32 bb asd 16 3424
32 cc asa 10 7567
31 ss fsf 23 3434