Get records based on latest date - sql

Question

In the below query I need to take only one record which is the latest phDate.
WITH TEMP_PAT_PIP_AddedBy
AS (
SELECT S.ppId
,(
SELECT PersonID
FROM [PFMADestination].[dbo].PERSON
WHERE SourceType = 'user_Users'
AND SourceId = S.uuId
) AS AddedByToStore
,phDate
FROM [PFMADestination].[dbo].PatientPIP D
INNER JOIN [PFMAOldProd].[dbo].pat_History S ON S.ppId = D.PatientId
AND phEvent = 'PIP-info uppdaterad'
)
--select * from TEMP_PAT_PIP_AddedBy order by ppId, phDate desc
UPDATE P
SET AddedBy = ISNULL(AddedByToStore, 1), Date=phDate
FROM TEMP_PAT_PIP_AddedBy T
INNER JOIN [PFMADestination].[dbo].[PatientPIP] P ON T.ppId = P.PatientId
Expected Output for CTE Take only latest phDate for each ppId and ignore other if its more than 1 record then update it.

Answer 1

Using partition by clause you can get expected output. Try following query :
WITH TEMP_PAT_PIP_AddedBy
AS (
SELECT S.ppId
,(
SELECT PersonID
FROM [PFMADestination].[dbo].PERSON
WHERE SourceType = 'user_Users'
AND SourceId = S.uuId
) AS AddedByToStore
,phDate , ROW_NUMBER() OVER(PARTITION BY S.ppId ORDER BY phDate DESC) AS NUM
FROM [PFMADestination].[dbo].PatientPIP D
INNER JOIN [PFMAOldProd].[dbo].pat_History S ON S.ppId = D.PatientId
AND phEvent = 'PIP-info uppdaterad'
)
UPDATE P
SET AddedBy = ISNULL(AddedByToStore, 1), Date=phDate
FROM TEMP_PAT_PIP_AddedBy T
INNER JOIN [PFMADestination].[dbo].[PatientPIP] P
ON T.ppId = P.PatientId AND T.NUM=1

Answer 2

Add phDate = max phDate condition to the where clause:
WITH TEMP_PAT_PIP_AddedBy
AS (
SELECT S.ppId
,(
SELECT PersonID
FROM [PFMADestination].[dbo].PERSON
WHERE SourceType = 'user_Users'
AND SourceId = S.uuId
) AS AddedByToStore
,phDate
FROM [PFMADestination].[dbo].PatientPIP D
INNER JOIN [PFMAOldProd].[dbo].pat_History S ON S.ppId = D.PatientId
AND phEvent = 'PIP-info uppdaterad'
)
SELECT *
FROM TEMP_PAT_PIP_AddedBy
where phDate = (select max(phDate) from TEMP_PAT_PIP_AddedBy
where ppId = TEMP_PAT_PIP_AddedBy.ppId)
ORDER BY ppId
,phDate DESC
Edited version, is phDate a P column? (If not, edit my answer.)
WITH TEMP_PAT_PIP_AddedBy
AS (
SELECT S.ppId
,(
SELECT PersonID
FROM [PFMADestination].[dbo].PERSON
WHERE SourceType = 'user_Users'
AND SourceId = S.uuId
) AS AddedByToStore
,phDate
FROM [PFMADestination].[dbo].PatientPIP D
INNER JOIN [PFMAOldProd].[dbo].pat_History S ON S.ppId = D.PatientId
AND phEvent = 'PIP-info uppdaterad'
AND phDate = (select max(phDate) from P
where ppId = P.ppId)
)
--select * from TEMP_PAT_PIP_AddedBy order by ppId, phDate desc
UPDATE P
SET AddedBy = ISNULL(AddedByToStore, 1), Date=phDate
FROM TEMP_PAT_PIP_AddedBy T
INNER JOIN [PFMADestination].[dbo].[PatientPIP] P ON T.ppId = P.PatientId
Svensk?