Select first row in each GROUP by group?

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Consider the below table

KEY    WO#    Parts   Name panels
77     11     1       aa     3
77     11     2       aa     4
81     12     2       bb     5
82     9      3       cc     6

Now i want to write a query for my report so that whenever theres a duplicate RKEY i want it to ignore it even though the number of parts in the duplicate RKEY are different and proceed with the next RKEY. Is this possible

End result
KEY    WO#    Parts   Name  panels
77     11     1       aa    3
81     12     2       bb    5
82     9      3       cc    6

What I have tried:

Not really sure how to achieve in sql2008

Posted 27-Jul-17 4:19am

Member 12336474

Updated 27-Jul-17 4:40am

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2 solutions

Solution 2

Try:

SQL

SELECT a.[Key], b.[WO#], b.Parts, b.Name, a.Panels FROM 
   (SELECT [Key], MIN(Panels) As Panels FROM MyTable GROUP BY [Key]) a
   JOIN MyTable b 
   ON a.[Key] = b.[Key] AND a.Panels = b.Panels

Posted 27-Jul-17 4:40am

OriginalGriff

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Bryian Tan · Accepted Answer · 2017-07-27T04:33:00

Have you try Row_Number function? Here is an example using CTE and Row_Number functions.

SQL

DECLARE  @temp TABLE ([KEY] INT, WO INT, Parts INT, Name VARCHAR(10), Panels INT)

INSERT INTO @temp
SELECT 77, 11, 1, 'aa' , 3
UNION
SELECT 77, 11, 2, 'aa' , 4
UNION
SELECT 81, 12, 2, 'bb' , 5
UNION
SELECT 82, 9, 3, 'cc' ,6

SELECT * FROM @temp

;WITH temp AS (
SELECT ROW_NUMBER() OVER (PARTITION BY [Key]
                          ORDER BY [Key] DESC
                         ) AS myrownum
       ,*    
from @temp )
SELECT [Key], WO 'WO#', Parts, Name, Panels FROM temp WHERE myrownum = 1

Output:

Key	WO#	Parts	Name	Panels
77	11	   1	aa	     3
81	12	   2	bb	     5
82	 9	   3	cc	     6