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SQL Syntax 101

Posted on 2011-09-17
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Last Modified: 2012-05-12
Attached is a small example of the database im working with

as you can see there can be several rrows for the same ITEM_NUMBER due to it having different ITEM_SUBSECTIONS and DATES

nevertheless each ITEM_NUMBER of 101 will always have the same SERIES and SERIES_SUBSECTION

I need the query syntax so that I get 1 full-row from each item_number that has the MIN_DATE under date
 
The excel sheet attached highlights it if im not communicting clearly
this is jsut a small same the master database has over 20,000 items in it


Example-Database.xls
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Question by:plusone3055
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Accepted Solution

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Kevin Cross earned 2000 total points
ID: 36555098
Hi.

You can probably do this via ROW_NUMBER() if I am understanding correctly and the issue is you cannot do a simple GROUP BY.

;WITH cte AS (
   SELECT {column list}
        , ROW_NUMBER() OVER(PARTITION BY ITEM_NUMBER ORDER BY DATES) RN
   FROM {your table}
)
SELECT {final column list}
FROM cte
WHERE RN = 1
;

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Author Comment

by:plusone3055
ID: 36555226
no i think i need the GROUP by
I don't know  the row number out of 200,000 rows representing 1000's of records

the example database shows several highlighted records
a representation for
101                          
102                            
201
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LVL 60

Expert Comment

by:Kevin Cross
ID: 36555233
Did you run the query I provided? If you use GROUP BY, you will have to aggregate on ALL the columns not involved in the grouping; therefore, you have to figure out if that is okay. If it is, then just determine the appropriate aggregate for each column. For date it is MIN(DATES) AS MIN_DATE.
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 36555435
Can you please share what else you needed other than this line?
ROW_NUMBER() OVER(PARTITION BY ITEM_NUMBER ORDER BY DATES) RN

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