SQL counting based on date comparison - sql

Question

I've got the following SQL query which gives me all of my assets which are older than two years, broken down by organization. Then I have to run it again and just remove the date comparison part in the WHERE clause to find out my total number of assets, so I can give a count of old, a count of total, and then a % old.
Is there a way to do this all as a single query? I'm thinking some type of case statement in the query maybe?
SELECT o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, COUNT(DISTINCT a.LabAssetSerialNbr) TotalAssets
FROM vw_DimLabAsset a
INNER JOIN vw_DimWorker w ON w.WorkerKey = a.LabAssetAssignedToWorkerKey
INNER JOIN vw_DimOrganizationHierarchy o ON o.OrganizationHierarchyUnitCd = w.WorkerOrganizationUnitCd
AND o.OrganizationHierarchyUnitLevelFourNm IS NOT NULL
WHERE a.SystemCreatedOnDtm < DATEADD(day, DATEDIFF(day, 0, DATEADD(yy, -2, GETDATE())), 0)
AND a.LabAssetTypeNm IN ('u_cmdb_ci_prototype_system', 'u_cmdb_ci_silicon')
AND a.LabAssetHardwareStatus <> 'retired'
AND (a.LabAssetHardwareSubStatus IS NULL OR a.LabAssetHardwareSubStatus <> 'archive')
GROUP BY o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm
ORDER BY 1, 2
I tried adding this to the select: `
SUM(CASE WHEN a.SystemCreatedOnDtm < DATEADD(day, DATEDIFF(day, 0, DATEADD(yy, -2, GETDATE())), 0) THEN 1 ELSE 0 END)
but that doesn't return the same count as the TotalAssets value.
Update
Here's the final query I ended up with:
DECLARE #date DateTime
SELECT #date = DATEADD(day, DATEDIFF(day, 0, DATEADD(yy, -2, GETDATE())), 0);
WITH pphw AS
(
SELECT DISTINCT o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, a.LabAssetSerialNbr, MIN(a.SystemCreatedOnDtm) MinCreated
FROM vw_DimLabAsset a
INNER JOIN vw_DimWorker w ON a.LabAssetAssignedToWorkerKey = w.WorkerKey
INNER JOIN vw_DimOrganizationHierarchy o ON w.WorkerOrganizationUnitCd = o.OrganizationHierarchyUnitCd
AND o.OrganizationHierarchyUnitLevelThreeNm IS NOT NULL
AND o.OrganizationHierarchyUnitLevelFourNm IS NOT NULL
WHERE LabAssetHardwareStatus <> 'Retired'
AND (LabAssetHardwareSubStatus IS NULL OR LabAssetHardwareSubStatus <> 'Archive')
AND a.LabAssetTypeNm IN ('u_cmdb_ci_prototype_system', 'u_cmdb_ci_silicon')
GROUP BY o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, a.LabAssetSerialNbr
)
SELECT OrganizationHierarchyUnitLevelThreeNm, OrganizationHierarchyUnitLevelFourNm,
SUM(CASE WHEN MinCreated < #date THEN 1 ELSE 0 END) AssetsOverTwoYears,
COUNT(DISTINCT LabAssetSerialNbr) TotalAssets
FROM pphw
GROUP BY OrganizationHierarchyUnitLevelThreeNm, OrganizationHierarchyUnitLevelFourNm
HAVING SUM(CASE WHEN MinCreated < #date THEN 1 ELSE 0 END) > 0
ORDER BY 1, 2

Answer 1

My answer is similar to tysonwright, but I think the GROUP BY clause should be outside of the sub-select. But, I would want sample data to validate this. The bottom line is that you should first gather all of the records that you want calculate metrics on via a sub-select. From there, you can perform your SUMs and COUNTs.
SELECT TMP1.OrganizationHierarchyUnitLevelThreeNm
,TMP1.OrganizationHierarchyUnitLevelFourNm
,TotalAssets = COUNT(TMP1.LabAssetSerialNbr)
,AssetsOver2YearsOld = SUM(TMP1.AssetOver2YearsOldInd)
,PercAssetsOver2YearsOld = SUM(TMP1.AssetOver2YearsOldInd) / COUNT(TMP1.LabAssetSerialNbr)
FROM (SELECT DISTINCT o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, a.LabAssetSerialNbr
,AssetOver2YearsOldInd = CASE WHEN a.SystemCreatedOnDtm < DATEADD(d, DATEDIFF(d, 0, DATEADD(yy, -2, GETDATE())), 0) THEN 1 ELSE 0 END
FROM vw_DimLabAsset a
INNER JOIN vw_DimWorker w
ON w.WorkerKey = a.LabAssetAssignedToWorkerKey
INNER JOIN vw_DimOrganizationHierarchy o
ON o.OrganizationHierarchyUnitCd = w.WorkerOrganizationUnitCd
AND o.OrganizationHierarchyUnitLevelFourNm IS NOT NULL
WHERE a.LabAssetTypeNm IN ('u_cmdb_ci_prototype_system', 'u_cmdb_ci_silicon')
AND a.LabAssetHardwareStatus <> 'retired'
AND (a.LabAssetHardwareSubStatus IS NULL
OR a.LabAssetHardwareSubStatus <> 'archive')
) TMP1
GROUP BY TMP1.OrganizationHierarchyUnitLevelThreeNm, TMP1.OrganizationHierarchyUnitLevelFourNm
ORDER BY 1, 2
Update:
To remove the duplicates by date time, you can use either the MIN or MAX function, depending one what your requirement is:
SELECT TMP1.OrganizationHierarchyUnitLevelThreeNm
,TMP1.OrganizationHierarchyUnitLevelFourNm
,TotalAssets = COUNT(TMP1.LabAssetSerialNbr)
,AssetsOver2YearsOld = SUM(CASE WHEN TMP1.MaxSystemCreatedOnDtm < DATEADD(d, DATEDIFF(d, 0, DATEADD(yy, -2, GETDATE())), 0) THEN 1 ELSE 0 END)
,PercAssetsOver2YearsOld = SUM(CASE WHEN TMP1.MaxSystemCreatedOnDtm < DATEADD(d, DATEDIFF(d, 0, DATEADD(yy, -2, GETDATE())), 0) THEN 1 ELSE 0 END) / COUNT(TMP1.LabAssetSerialNbr)
FROM (SELECT DISTINCT o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, a.LabAssetSerialNbr, MaxSystemCreatedOnDtm = MAX(a.SystemCreatedOnDtm)
FROM vw_DimLabAsset a
INNER JOIN vw_DimWorker w
ON w.WorkerKey = a.LabAssetAssignedToWorkerKey
INNER JOIN vw_DimOrganizationHierarchy o
ON o.OrganizationHierarchyUnitCd = w.WorkerOrganizationUnitCd
AND o.OrganizationHierarchyUnitLevelFourNm IS NOT NULL
WHERE a.LabAssetTypeNm IN ('u_cmdb_ci_prototype_system', 'u_cmdb_ci_silicon')
AND a.LabAssetHardwareStatus <> 'retired'
AND (a.LabAssetHardwareSubStatus IS NULL
OR a.LabAssetHardwareSubStatus <> 'archive')
GROUP BY o.OrganizationHierarchyUnitLevelThreeNm, o.OrganizationHierarchyUnitLevelFourNm, a.LabAssetSerialNbr
) TMP1
GROUP BY TMP1.OrganizationHierarchyUnitLevelThreeNm, TMP1.OrganizationHierarchyUnitLevelFourNm
ORDER BY 1, 2

Answer 2

I think this will get you what you need:
SELECT
s.OrganizationHierarchyUnitLevelThreeNm,
s.OrganizationHierarchyUnitLevelFourNm,
COUNT(*) TotalAssets,
SUM(CASE WHEN s.SystemCreatedOnDtm < DATEADD(day, DATEDIFF(day, 0, DATEADD(yy, -2, GETDATE())), 0)
THEN 1 ELSE 0 END) AssetsOver2YearsOld,
SUM(CASE WHEN s.SystemCreatedOnDtm < DATEADD(day, DATEDIFF(day, 0, DATEADD(yy, -2, GETDATE())), 0)
THEN 1 ELSE 0 END) / COUNT(*) PercAssetsOver2YearsOld
FROM
(
SELECT
o.OrganizationHierarchyUnitLevelThreeNm,
o.OrganizationHierarchyUnitLevelFourNm
a.LabAssetSerialNbr,
a.SystemCreatedOnDtm
FROM
vw_DimLabAsset a
INNER JOIN
vw_DimWorker w
ON
w.WorkerKey = a.LabAssetAssignedToWorkerKey
INNER JOIN
vw_DimOrganizationHierarchy o
ON
o.OrganizationHierarchyUnitCd = w.WorkerOrganizationUnitCd
AND
o.OrganizationHierarchyUnitLevelFourNm IS NOT NULL
WHERE
a.LabAssetTypeNm IN ('u_cmdb_ci_prototype_system', 'u_cmdb_ci_silicon')
AND
a.LabAssetHardwareStatus <> 'retired'
AND
(a.LabAssetHardwareSubStatus IS NULL OR a.LabAssetHardwareSubStatus <> 'archive')
GROUP BY
o.OrganizationHierarchyUnitLevelThreeNm,
o.OrganizationHierarchyUnitLevelFourNm
a.LabAssetSerialNbr,
a.SystemCreatedOnDtm
) AS s