SQL server rank rows by group and condition - sql

Question

I need help with ranking of rows in one table.
+-----+-------+-------------+------------+-------+------+
| ID | group | typeInGroup | rankOfType | score | Rank |
+-----+-------+-------------+------------+-------+------+
| 1 | a | type1 | 1 | 40 | |
| 2 | a | type2 | 2 | 55 | |
| 3 | a | type1 | 1 | 20 | |
| 4 | b | type3 | 3 | 80 | |
| 5 | b | type2 | 2 | 60 | |
| 6 | b | type1 | 1 | 70 | |
| 7 | b | type1 | 1 | 70 | |
+-----+-------+-------------+------------+-------+------+
I am basically looking for solution which would give me order for last column "Rank".
Each "group" has up to 9 "typeInGroup" which are ranked by 1-9 in column "rankOfTypes". Each "typeInGroup" has "score". When i am calculating last column "Rank" i look at the "score" and "rankOfType" column.
The row with the higgest score should be ranked first unless there is row with "rankOfType" column that has lower value and score that is <= 15 than the score we have been looking at. Order of rows with same "score" and "rankOfType" is not important.
I should do this check for every single row in group and in the end end with something like this:
+-----+-------+-------------+------------+-------+------+
| ID | group | typeInGroup | rankOfType | score | Rank |
+-----+-------+-------------+------------+-------+------+
| 1 | a | type1 | 1 | 40 | 1 |
| 2 | a | type2 | 2 | 55 | 2 |
| 3 | a | type1 | 1 | 20 | 3 |
| 4 | b | type3 | 3 | 80 | 3 |
| 5 | b | type2 | 2 | 60 | 4 |
| 6 | b | type1 | 1 | 70 | 1 |
| 7 | b | type1 | 1 | 70 | 2 |
+-----+-------+-------------+------------+-------+------+
Any idea how to do this?

Answer 1

the CROSS APPLY query, checks for any rows that meet your special requirement, if exists, than that row will have higher priority
try it out with larger data set and verify the result
declare #tbl table
(
ID int,
Grp char,
typeInGrp varchar(5),
rankOfType int,
score int
)
insert into #tbl select 1, 'a', 'type1', 1, 40
insert into #tbl select 2, 'a', 'type2', 2, 55
insert into #tbl select 3, 'a', 'type1', 1, 20
insert into #tbl select 4, 'b', 'type3', 3, 80
insert into #tbl select 5, 'b', 'type2', 2, 60
insert into #tbl select 6, 'b', 'type1', 1, 70
insert into #tbl select 7, 'b', 'type1', 1, 70
select *,
[rank] = row_number() over (partition by Grp
order by case when cnt > 0 then 1 else 2 end,
score desc)
from #tbl t
cross apply
(
select cnt = count(*)
from #tbl x
where x.Grp = t.Grp
and x.ID <> t.ID
and x.rankOfType > t.rankOfType
and x.score - t.score <= 15
) s
order by ID