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Purging duplicate records?

Posted on 2006-05-04
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Last Modified: 2006-11-18
I have a table with three fields:

Item        varchar(4)
Customer  varchar(4)
price        smallmoney


sometimes there are more than one matching record. A matching record is when (item + customer) is the same.

Is there a way to eliminate all the duplicates besides for the last one. The last one would be the one that was added to the table last. This table is a temporary table with no indexes.
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Question by:szx248
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LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 16608128
ALTER your temp table to add an identity column 'i'

delete from #tempTable
WHERE i NOT IN (SELECT MAX(i) FROM #tempTable GROUP BY (item + customer) )
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Author Comment

by:szx248
ID: 16608187
Very neat!

Now do I give the temporary table an identity column?

this is what my temporary table looks like:
 CREATE TABLE #tempfile ( cus varchar(4), item varchar(4) , price smallmoney)
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Accepted Solution

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Aneesh Retnakaran earned 200 total points
ID: 16608203
CREATE TABLE #tempfile ( i int identity , cus varchar(4), item varchar(4) , price smallmoney)
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Author Comment

by:szx248
ID: 16608324
awesome!
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