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Need help with query....

Author

Topic

focus_nz
Starting Member

2 Posts

Posted - 2004-08-30 : 18:09:01

I have a table called 'DiskDrive' which has the following data in it. The table contains the history of the free space on the specific disk drives.


-------------------------------------------------
| DiskID | DriveLetter | FreeSpace | Updated    | 
-------------------------------------------------
| 1      | C:          | 50        | 2004-08-20 |
| 1      | C:          | 100       | 2004-08-10 |
| 1      | A:          | 0         | 2004-08-01 |
| 1      | C:          | 500       | 2004-08-01 |
| 1      | D:          | 100       | 2004-08-01 |
-------------------------------------------------

I need it to display all the distinct drive letters but only include the values from the lastest update.
So the recordset that I want to be returned is...


-------------------------------------------------
| DiskID | DriveLetter | FreeSpace | Updated    | 
-------------------------------------------------
| 1      | A:          | 0         | 2004-08-01 |
| 1      | C:          | 50        | 2004-08-20 |
| 1      | D:          | 100       | 2004-08-01 |
-------------------------------------------------

Any idea of how I can write this into a single query I can create as a view?

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2004-08-30 : 18:14:01

[code]

SELECT d2.DiskID, d2.DriveLetter, d1.FreeSpace, d2.Updated
FROM DiskDrive d1
INNER JOIN
(
SELECT DiskID, DriveLetter, MAX(Updated) AS Updated
FROM DiskDrive
GROUP BY DiskID, DriveLetter
) d2
ON d1.DiskID = d2.DiskID AND d1.DriveLetter = d2.DriveLetter AND d1.Updated = d2.Updated
ORDER BY d2.DiskID, d2.DriveLetter

[/code]

Tara

focus_nz
Starting Member

2 Posts

Posted - 2004-08-30 : 18:23:31

Thanks, that was what I was after.

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