Only assign values to entries relevant to condition - sql

Question

I have the following code
with my_table (id, student, category, score)
as (values
(1, 'Alex', 'A', 11),
(2, 'Alex', 'D', 4),
(3, 'Bill', 'A', 81),
(4, 'Bill', 'B', 1),
(5, 'Bill', 'D', 22),
(6, 'Carl', 'C', 5),
(7, 'Carl', 'D', 10)
)
select
id, student, category, score,
case when
max(score) filter (where category in ('A', 'B', 'C')) over (partition by student) >
min(score) filter (where category = 'D') over (partition by student)
then 'Review'
else 'Pass'
end as result
from my_table
order by student, id
which outputs
id student category score conclusion
1 Alex A 11 Review
2 Alex D 4 Review
3 Bill A 81 Review
4 Bill B 1 Review
5 Bill D 22 Review
6 Carl C 5 Pass
7 Carl D 10 Pass
How can I edit it so only the entries where either A, B, or C are larger than D are assigned 'Review' to them. So in this case, the desired output would be:
id student category score conclusion
1 Alex A 11 Review
2 Alex D 4 Review
3 Bill A 81 Review
4 Bill B 1 Pass
5 Bill D 22 Review
6 Carl C 5 Pass
7 Carl D 10 Pass
For Bill, A>D so Review is assigned to it; B<D so Pass is assigned to it.

Answer 1

From your logic, you can try to use subquery to get count then compare
with my_table (id, student, category, score)
as (values
(1, 'Alex', 'A', 11),
(2, 'Alex', 'D', 4),
(3, 'Bill', 'A', 81),
(4, 'Bill', 'B', 1),
(5, 'Bill', 'D', 22),
(6, 'Carl', 'C', 5),
(7, 'Carl', 'D', 10)
)
SELECT id, student, category, score,
CASE WHEN
COUNT(*) filter (where D_Score<score) over (partition by student) = 0 OR score < D_Score
THEN 'Pass'
ELSE 'Review' END
FROM (
SELECT *,
min(score) filter (where category = 'D') over (partition by student) D_Score
FROM my_table
) t1
sqlfiddle