Question

I have table that stores a log of changes to objects in another table. Here are my table contents:

ObjID   Color   Date                     User
------- ------- ------------------------ --------
1       Red     2010-01-01 12:22:00.000  Joe
1       Blue    2010-01-02 15:22:00.000  Jill
1       Green   2010-01-03 16:22:00.000  Joe
1       White   2010-01-10 09:22:00.000  Mike
2       Red     2010-01-09 10:22:00.000  Mike
2       Blue    2010-01-12 09:22:00.000  Jill
2       Orange  2010-01-12 15:22:00.000  Joe

I want to select the most recent date for each Object, as well as the Color and User on the date of that record.

Bascically, I want this result set:

ObjID   Color   Date                     User
------- ------- ------------------------ --------
1       White   2010-01-10 09:22:00.000  Mike
2       Orange  2010-01-12 15:22:00.000  Joe

I’m having trouble wrapping my head around the SQL query I need to write to get this data…

I am retrieving data via ODBC from an iSeries DB2 database (AS/400).

Answer 1

Hey there, I think you want the following (where ColorTable is your table name):

SELECT Color.* 
FROM ColorTable as Color
INNER JOIN 
(
SELECT ObjID, MAX(Date) as Date
FROM ColorTable
GROUP BY ObjID
) as MaxDateByColor
ON Color.ObjID = MaxDateByColor.ObjID
AND Color.Date = MaxDateByColor.Date