Week based count - sql

Question

I have a requirement to retrieve the data in the below fashion
Weeks delay_count
0 6
1 0
2 3
3 4
4 0
5 1
6 0
7 0
8 0
9 0
10 2
11 0
12 0
13 0
14 0
15 3
Here weeks is the hard coded column from 0 to 15 and delay_count is the derived column. I have a column delay_weeks. Based on the values in this column I need to populate the values in the delay_count column (derived column)
delay_weeks column values are below.
blank
blank
blank
2
10
5
blank
3
2
10
2
3
3
3
0
0
15
22
29
Conditions:
When delay_weeks is blank or 0 then count in the delay_count column should be 1
When delay_weeks is 3 then in the delay_count column the count should be 1 under week 3
When delay_weeks is 10 then in the delay_count column the count should be 1 under week 10
When delay_weeks is greater than or equal to 15 then in the delay_count column the count should be 1 under week 15.
I wrote code like below
SELECT "Weeks", a."delay_count"
FROM (SELECT LEVEL AS "Weeks"
FROM DUAL
CONNECT BY LEVEL <= 15) m,
(SELECT VALUE, COUNT (VALUE) AS "delay_numbers"
FROM (SELECT CASE
WHEN attr11.VALUE >= 15
THEN '15'
ELSE attr11.VALUE
END
VALUE
FROM docs,
(SELECT object_id, VALUE, attribute_type_id
FROM ATTRIBUTES
WHERE attribute_type_id =
(SELECT attribute_type_id
FROM attribute_types
WHERE name_display_code =
'ATTRIBUTE_TYPE.DELAY IN WEEKS')) attr11
WHERE docs.obj_id = attr11.object_id(+)
GROUP BY VALUE) a
WHERE m."Weeks" = a.VALUE(+)

Answer 1

select
weeks,
nvl(cnt, 0) as delay_count
from
(select level-1 as weeks from dual connect by level < 17)
left join (
select
nvl(least(attr11.value, 15), 0) as weeks,
count(0) as cnt
from
DOCS
left join (
ATTRIBUTES attr11
join ATTRIBUTE_TYPES atr_tp using(attribute_type_id)
)
on atr_tp.name_display_code = 'ATTRIBUTE_TYPE.DELAY IN WEEKS'
and docs.obj_id = attr11.object_id
group by nvl(least(attr11.value, 15), 0)
) using(weeks)
order by 1

Answer 2

Reverse-engineering the relevant parts of the table definitions, I think this gives you what you want:
select t.weeks, count(delay) as delay_count
from (select level - 1 as weeks from dual connect by level <= 16) t
left join (
select case when a.value is null then 0
when to_number(a.value) > 15 then 15
else to_number(a.value) end as delay
from docs d
left join (
select a.object_id, a.value
from attributes a
join attribute_types at on at.attribute_type_id = a.attribute_type_id
where at.name_display_code = 'ATTRIBUTE_TYPE.DELAY IN WEEKS'
) a on a.object_id = d.obj_id
) delays on delays.delay = t.weeks
group by t.weeks
order by t.weeks;
With what I think is matching data I get:
WEEKS DELAY_COUNT
---------- -----------
0 6
1 0
2 3
3 4
4 0
5 1
6 0
7 0
8 0
9 0
10 2
11 0
12 0
13 0
14 0
15 3
But obviously since you haven't given the real table structures I'm guessing a bit on the relationships. Obligatory SQL Fiddle.