asked on

Group by with a min() and same row detail..

Given the following two tables :

Table A
StockID      Item
1      Desks
2      Chairs
3      Tables
4      Plants
5      Lights


Table B
StockID      Date      Qty
4      01/01/2010      2
4      05/02/2010      5
4      06/02/2010      1
3      06/02/2010      5
3      14/03/2010      3

What select query would join and select earliest date value only and corresponding quantity. :
e.g :

StockID      Item      Date      Qty
4      Plants      01/01/2010      2
3      Tables      06/02/2010      5

Thanks in advance!

BrandonGalderisi

Do you have an identity column in the table?

waltersnowslinarnold

Use the following code sample..,

SELECT a.StockID, a.Item, MIN(b.Date), b.Qty FROM TableA a 
INNER JOIN TableB b ON b.StockID = a.StockID
GROUP BY a.StockID, a.Item, b.Qty

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Rajkumar Gs

Try this query. This should work on SQL Server 2000 also.

Regards
Raj

SELECT a.StockID, a.Item, b.Date, b.Qty            
FROM tableB B
INNER JOIN tableA A
	on a.StockID = b.StockID
INNER JOIN
(
	select StockID, max(date) as Date
	from tableB
	group by StockID
) C on c.StockID = B.StockID and c.Date = B.Date

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Rajkumar Gs

Oh! for "earliest' date use min instead of max

Raj

SELECT a.StockID, a.Item, b.Date, b.Qty            
FROM #tableB B
INNER JOIN #tableA A
	on a.StockID = b.StockID
INNER JOIN
(
	select StockID, min(date) as Date
	from #tableB
	group by StockID
) C on c.StockID = B.StockID and c.Date = B.Date

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Parth Malhan

Try the following code:

SELECT a.StockID, a.Item, b.Date, b.Qty
FROM t2 B
INNER JOIN t1 A
on a.StockID = b.StockID
INNER JOIN
(
select StockID, min(date) as Date
from t2
group by StockID
) C on c.StockID = B.StockID and c.Date = B.Date

this will give you the records for minimum date for every stockid

David Glover

ASKER

Sorry I should have made clearer, this is SQL server 2000 as in the tags, but unfortunately I couldn't see a sql 2000 group to post this against.

Unfortunately none of the examples above worked. My tables are named a and b for simplicity...

BrandonGalderisi:
There is an identity coloumn in table B but it isn't relevant to the solution or any join. The earliest date does not mean the lowest identifier in this solution either so it lends no function there.

waltersnowslinarnold:
invalid object name dbo.tableA

RajkumarGS:
Invalid object name dbo.tableB

parthmalhan:
Invalid object name dbo.t2

Thanks guys for your suggestions any tweaks suggested?

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willz123

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David Glover

ASKER

Thanks alot, that got me there. I often get this sort of query where I need a join based on the minimum value of another field in the joining table and its other corresponding values, so this helps alot.
Thanks again!