sql server - SQL - "duplicate" records but with different dates AND within same day -


we having issues online payment gateway system duplicating transaction entries within minutes of each other.

we want create record of these transactions, can analyse , correct them.

single table, follows. shows results 1 card number. prefer return transactions occurred on same day, , preferably within 5 seconds of each other last 2 rows.

txn_authcode   card_number   cardtype   txn_status   txn_value   entrytimestamp ------------------------------------------------------------------------------- 1491109220     ....0279      visa       failed       20.00       2011-06-24 19:49:00 1491109219     ....0279      visa       failed       20.00       2012-05-28 22:47:57 1491109218     ....0279      visa       failed       20.00       2012-05-28 22:46:39 1491109217     ....0279      visa       failed       20.00       2012-05-28 22:46:35

so far, have following, gets duplicate records given card number, not sure how granularize further in order records in same day , preferably within 5 seconds of each other.

        select * from(             select  t1.txn_authcode,t1.txn_status,t1.txn_value,t1.entrytimestamp                    transactions t1                 1=1                 , exists                 (select null                    transactions t2                   t1.card_number = t2.card_number                  , t1.entrytimestamp <> t2.entrytimestamp                  , t2.entrytimestamp >= '2012-05-01'                  , t2.entrytimestamp <= '2012-06-01'                  --*** , datediff ( day , t1.entrytimestamp , t2.entrytimestamp ) < 1      --(datediff above doesn't work can return single record given card,  --but want records have @ least 1 other transaction record on same  --day same card)                   )                  , t1.entrytimestamp >= '2012-05-01'                  , t1.entrytimestamp <= '2012-06-01'              )x         order card_number,entrytimestamp desc

could give me hand please?

... , datediff ( day , t1.entrytimestamp , t2.entrytimestamp ) < 1 , t1.txn_authcode < t2.txn_authcode ...

replace commented out part of query above statement , should need.


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