Find Duplicate Data

Hi ,
Can someone help me to build a query base on :
SELECT Full_Name,FLT_ID, FLT_DT_ID,PNR_ID
Where Full_Name,FLT_ID, FLT_DT_ID is duplicate in the same table
Thank You very much
Travis Tan
On Wed, 3 Aug 2005 00:23:02 -0700, Travis wrote:

>Hi ,
> Can someone help me to build a query base on :
> SELECT Full_Name,FLT_ID, FLT_DT_ID,PNR_ID
> Where Full_Name,FLT_ID, FLT_DT_ID is duplicate in the same table
>Thank You very much
SELECT a.Full_Name, a.FLT_ID, a.FLT_FT_ID, a.PNR_ID
FROM MyTable AS a
INNER JOIN MyTable AS b
ON b.Full_Name = a.Full_Name
AND b.FLT_ID = a.FLT_ID
AND b.FLT_FT_ID = a.FLT_FT_ID
AND b.PNR_ID <> a.PNR_ID
or
SELECT a.Full_Name, a.FLT_ID, a.FLT_FT_ID, a.PNR_ID
FROM MyTable AS a
WHERE EXISTS
(SELECT *
FROM MyTable AS b
WHERE b.Full_Name = a.Full_Name
AND b.FLT_ID = a.FLT_ID
AND b.FLT_FT_ID = a.FLT_FT_ID
AND b.PNR_ID <> a.PNR_ID)
or
SELECT a.Full_Name, a.FLT_ID, a.FLT_FT_ID, a.PNR_ID
FROM MyTable AS a
INNER JOIN (SELECT Full_Name, FLT_ID, FLT_FT_ID
FROM MyTable
GROUP BY Full_Name, FLT_ID, FLT_FT_ID
HAVING COUNT(*) > 1) AS b
ON b.Full_Name = a.Full_Name
AND b.FLT_ID = a.FLT_ID
AND b.FLT_FT_ID = a.FLT_FT_ID
Try them all in your database to see which one gives the best
performance.
Disclaimer: All queries above are untested, since you didn't provide
CREATE TABLE and INSERT statements to test them on.
Best, Hugo
(Remove _NO_ and _SPAM_ to get my e-mail address)