SQL query count occurrences then group by day but also fill missing days - sql

Question

I have a table called diseaseScores which has calculation results. Each hour a running score is calculated (currentScore). The objective of this query is to group the hourly scores by the day (obsDate), then count the numberOfhours where the running score is at a level considered high. High is greater than 16 (currentScore > 16).
My query so far is:
SELECT
DATEADD(DAY, 0, DATEDIFF(day, 0, obsDate)) AS obsDate,
(CASE
WHEN count(id) > 12 THEN count(id)
ELSE 0
END) numOfHoursAtHigh
FROM
diseaseScores
WHERE
diseaseID = 2
AND siteID = 72160
AND numOfRotationYears = 3
AND currentScore > 16
AND month(obsDate) IN (6)
GROUP BY
DATEADD(DAY, 0, DATEDIFF(day, 0, obsDate))
ORDER BY
DATEADD(DAY, 0, DATEDIFF(day, 0, obsDate));
The query returns results for 13 days of the month. I wish to fill the gaps so I a have a record for each of the day of the month. The gaps need to have a numOfHoursAtHigh result of 0.
How can I do this? This is for SQL Server 2008 +
The result set being returned is:
2016-06-04 00:00:00.000 0
2016-06-05 00:00:00.000 23
2016-06-06 00:00:00.000 23
2016-06-07 00:00:00.000 23
2016-06-08 00:00:00.000 3
2016-06-09 00:00:00.000 23
2016-06-10 00:00:00.000 0
2016-06-17 00:00:00.000 13
2016-06-18 00:00:00.000 23
2016-06-19 00:00:00.000 0
2016-06-20 00:00:00.000 14
2016-06-21 00:00:00.000 23
2016-06-22 00:00:00.000 16
UPDATE : So using a modified version of knobcreekmans approach (was doubling up certain days) I now have this which does fill my gaps and works great for one month. As soon as I ask for two months worth by changing month(obsDate) IN (6) to month(obsDate) IN (6,7) it skips days if they happen to clash in month 6 and 7. Grrrrrr, am so close!
SELECT CAST(obsDate AS DATE) as obsDate,
(CASE
WHEN COUNT(id) > 12 THEN COUNT(id)
ELSE 0
END) numOfHoursAtHigh
FROM diseaseScores
WHERE diseaseID=2
AND siteID=72160
AND numOfRotationYears=3
AND currentScore > 16
AND month(obsDate) IN (6)
GROUP BY CAST(obsDate AS DATE)
UNION
SELECT CAST(obsDate AS DATE) AS obsDate,
0 AS numOfHoursAtHigh
FROM diseaseScores
WHERE diseaseID=2
AND siteID=72160
AND numOfRotationYears=3
AND currentScore <= 17
AND month(obsDate) IN (6)
and day(obsDate) NOT IN --<-- added from here
(
SELECT distinct day(obsDate)
FROM diseaseScores
WHERE diseaseID=2
AND siteID=72160
AND numOfRotationYears=3
AND currentScore > 16
AND month(obsDate) IN (6)
) --<-- to here to omit the duplicates
GROUP BY CAST(obsDate AS DATE)
ORDER BY CAST(obsDate AS DATE)
To answer to the question around the expected result. Its one record for each day of the month (or months) giving to columns. A date and then an integer for numOfHoursAtHigh e.g
2016-06-01 0
2016-06-02 0
2016-06-03 0
2016-06-04 0
2016-06-05 23
2016-06-06 23
2016-06-07 23
2016-06-08 23
2016-06-09 23
2016-06-10 0
2016-06-11 0
2016-06-12 0
2016-06-13 0
2016-06-14 0
2016-06-15 0
2016-06-16 0
2016-06-17 13
2016-06-18 23
2016-06-19 0
2016-06-20 14
2016-06-21 23
2016-06-22 16
2016-06-23 0
2016-06-24 0
2016-06-25 0
2016-06-26 0
2016-06-27 0
2016-06-28 0
2016-06-29 0
2016-06-30 0

Answer 1

You could create another SELECT that is the same as the original, modify the part of your WHERE clause that is filtering out the results you want (currentScore > 16), and then UNION them together.
SELECT CAST(obsDate AS DATE) as obsDate,
(CASE
WHEN COUNT(id) > 12 THEN COUNT(id)
ELSE 0
END) numOfHoursAtHigh
FROM diseaseScores
WHERE diseaseID=2
AND siteID=72160
AND numOfRotationYears=3
AND currentScore > 16
AND month(obsDate) IN (6)
GROUP BY CAST(obsDate AS DATE)
UNION
SELECT CAST(obsDate AS DATE) AS obsDate,
0 AS numOfHoursAtHigh
FROM diseaseScores
WHERE diseaseID=2
AND siteID=72160
AND numOfRotationYears=3
AND currentScore < 17 --<-- note the change
AND month(obsDate) IN (6)
GROUP BY CAST(obsDate AS DATE)
ORDER BY CAST(obsDate AS DATE)

Answer 2

Hi, You can have the below query,
SELECT DS.dateadd(DAY,0, datediff(day,0, obsDate)) as obsDate,
CASE
WHEN DS1.COUNT(id) > 12 THEN COUNT(id)
ELSE 0
END AS numOfHoursAtHigh
FROM diseaseScores DS
INNER JOIN (
SELECT dateadd(DAY,0, datediff(day,0, obsDate)) AS date, COUNT(id)
FROM diseaseScores GROUP BY date
) DS1
ON DS.date = DS1.obsDate
AND DS.diseaseID=2
AND DS.siteID=721DS.60
AND DS.numOfRotationYears=3
AND DS.currentScore > 16
AND DS.month(obsDate) IN (6)
ORDER BY DS.obsDate;