Counting partial values or conditional values - mysql

Question

I hope someone can lend an assist and some advise here. I'm trying to get a fairly complex result and not sure if I can do it as one query with subqueries, a union, or simply separate queries to be merged into excel after the fact.
I'm working with a legacy database from my predecessor with the following tables:
Business (columns working with: id, sector, state)
Forms (columns working with: Submitted (Y/N), id, business_id)
Inventory (Columns working with: In_stock (Y/N), id, form_id)
I'm trying to get a final result that looks like this:
| SubmittedForms | Unsubmitted Forms | Sector | State |
|-----------------------------------------------------|
| 10 | 5 | Agr | UT |
| 0 | 7 | Chem | MT |
| 2 | 1 | Bio | OK |
| 13 | 0 | Chem | NM |
The main problem I'm getting is that while submitted forms doesn't need any further arguments and is a simple count, the unsubmitted forms are dependent on the Inventory.in_stock='Y'. Here's my query for the submitted forms:
SELECT COUNT(Forms.id) AS Submitted, Business.sector, Business.state
FROM Forms
JOIN Business ON Forms.business_id=Business.id
WHERE Forms.submitted='Y'
GROUP BY Business.state, Business.sector
Unfortunately, I can't seem to get the unsubmitted forms number to calculate correctly. It just returns the total count of rows where in_stock is Y for that sector.
If it's easier to run a separate query for Submitted and Unsubmitted that's fine for the end result but I need some help getting the correct count of Unsubmitted forms with the in_stock flagged as Y. Also, I attempted to use a COUNT DISTINCT but takes way too long, was still running after 10 minutes. Another complication I can envision in a single query option is the possibility of 0/null values in either Submitted or Unsubmitted forms
Any help is greatly appreciated!

Answer 1

One option:
SELECT COUNT(CASE WHEN Forms.submitted = 'Y' THEN 1 END) SubmittedForms,
COUNT
( CASE WHEN Forms.submitted = 'N'
AND EXISTS ( SELECT 1
FROM Inventory
WHERE form_id = Forms.id
AND in_stock = 'Y'
)
THEN 1
END
) UnsubmittedForms,
Business.sector Sector,
Business.state State
FROM Forms
RIGHT
OUTER
JOIN Business
ON Forms.business_id = Business.id
GROUP
BY Business.sector,
Business.state
;
Another option, which might perform better:
SELECT COUNT(CASE WHEN Forms.submitted = 'Y' THEN 1 END) SubmittedForms,
COUNT(CASE WHEN Forms.submitted = 'N' THEN 1 END) UnsubmittedForms,
Business.sector Sector,
Business.state State
FROM ( SELECT *
FROM Forms
WHERE submitted = 'Y'
OR id IN ( SELECT DISTINCT form_id
FROM Inventory
AND in_stock = 'Y'
)
) Forms
RIGHT
OUTER
JOIN Business
ON Forms.business_id = Business.id
GROUP
BY Business.sector,
Business.state
;