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kt
Starting Member

38 Posts
Posted - 03/01/2013 :  13:00:32  Show Profile  Reply with Quote
I want to return the the max value, but my query below return duplicate records. How can i make this query to run only max
records like in the reuslts B

SELECT
orderNo,
MAX(DeliveryDate) as DeliveryDate,
MAX(DateChange) as DateChange,
DateSchedule
FROM sales
GROUP BY orderNo,DateSchedule
order by orderNo

Results A:
OrderNo DeliveryDate DateChange DateSchedule
222 2012-12-14 2012-12-04 2005-12-16
555 2006-07-23 2011-10-19 2001-01-01
444 2007-01-26 2007-01-23 2006-09-08
444 2007-01-26 2007-01-23 2007-01-15
444 2007-01-26 2007-01-24 2001-01-23
666 2006-11-30 2006-10-23 2006-09-07
666 2006-10-05 2006-01-23 2006-10-26

Results B:
OrderNo DeliveryDate DateChange DateSchedule
222 2012-12-14 2012-12-04 2005-12-16
555 2006-07-23 2011-10-19 2001-01-01
444 2007-01-26 2007-01-24 2001-01-23
666 2006-11-30 2006-10-23 2006-09-07

thanks

visakh16
Very Important crosS Applying yaK Herder

India
48072 Posts
Posted - 03/01/2013 :  13:12:53  Show Profile  Reply with Quote 

SELECT OrderNo, DeliveryDate, DateChange, DateSchedule
FROM
(
SELECT *,ROW_NUMBER() OVER (PARTITION BY OrderNo ORDER BY DeliveryDate DESC,DateChange DESC) AS Seq
FROM sales
)t
WHERE Seq=1


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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kt
Starting Member

38 Posts
Posted - 03/01/2013 :  13:33:59  Show Profile  Reply with Quote
did not work, not give me the max date for DateChange
Edited by - kt on 03/01/2013 13:47:13
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James K
Flowing Fount of Yak Knowledge

1733 Posts
Posted - 03/01/2013 :  13:39:27  Show Profile  Reply with Quote
Logically the query is correct. So it may be that the table is large and so it takes a long time. How many rows do you have in the sales table? You can query like this:
SELECT row_count 
FROM sys.dm_db_partition_stats
WHERE OBJECT_NAME(OBJECT_ID) = 'Sales'
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kt
Starting Member

38 Posts
Posted - 03/01/2013 :  14:28:42  Show Profile  Reply with Quote
it finally work, but not give the me max date for DateChange field.
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visakh16
Very Important crosS Applying yaK Herder

India
48072 Posts
Posted - 03/02/2013 :  02:19:55  Show Profile  Reply with Quote
so you want to only consider max value for DateChange? then use this instead


SELECT OrderNo, DeliveryDate, DateChange, DateSchedule
FROM
(
SELECT *,ROW_NUMBER() OVER (PARTITION BY OrderNo ORDER BY DeliveryDate DESC,DateChange DESC) AS Seq
FROM sales
)t
WHERE Seq=1


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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