Get the latest date for each record

Question

I have a History table (like a log) that records changes to parts:

TransactionID    Part ID          Description        Last Updated
1                1                   


        

Answer 1

Here's How I would do it

 ;WITH CTE AS 
 (
 Select PartId, MAX(LASTUPDATED) as 'MAXX' from part group by PartId
 ) 
 Select TransActionId, p.PartId, Description, p.LASTUPDATED
 from Part p
 inner join CTE on p.LastUpdated = CTE.MAXX
                and p.PartId = CTE.PartId           

Answer 2

SELECT t.TransactionID, t.PartID, t.Description, t.LastUpdated
FROM History t
JOIN (SELECT PartID, MAX(TransactionID)
FROM History
GROUP BY PartID) t2 ON t.PartID = t2.PartID
AND t.TransactionID = t2.TransactionID

will also work.

Answer 3

SELECT TransactionID
      ,PartID
      ,[Description]
      ,[Last Updated]
FROM (
    SELECT TransactionID
          ,PartID
          ,[Description]
          ,[Last Updated]
          ,ROW_NUMBER() OVER (PARTITION BY [PartID] ORDER BY [Last Updated] DESC) RN 
    FROM TableName
    )A
WHERE A.RN = 1

Or you can use CTE

;WITH CTE AS
  (
    SELECT TransactionID
          ,PartID
          ,[Description]
          ,[Last Updated]
          ,ROW_NUMBER() OVER (PARTITION BY [PartID] ORDER BY [Last Updated] DESC) RN 
    FROM TableName
  )
SELECT TransactionID
      ,PartID
      ,[Description]
      ,[Last Updated]  
FROM CTE 
WHERE A.RN = 1

Answer 4

select 
    TransactionID, PartID, Description, LastUpdated
from 
    History H
where
    LastUpdated = 
    (
        select 
            max(LastUpdated) 
        from 
            History
        where
            PartID = H.PartID
    )