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AskSQLTeam
Ask SQLTeam Question
0 Posts |
 Posted - 2002-06-28 : 09:46:54
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| Vahit Kis writes "Hi, I have a very large table which keeps card transactions.I am trying to write a cleanup function which deletes records older than 6 months. But there is a restriction here.I have to keep the latest transaction of a card even if thattransaction is older than 6 months.For example,A card has 10 transactions and all of them are older than 6 months. I have to keep the latest transaction and delete the other 9 transactions.What is the best and fast way to do this task?Best regards.Vahit KIS" |
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setbasedisthetruepath
Used SQL Salesman
992 Posts |
Posted - 2002-06-28 : 10:55:24
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quote:
Vahit Kis writes "Hi, I have a very large table which keeps card transactions.I am trying to write a cleanup function which deletes records older than 6 months. But there is a restriction here.I have to keep the latest transaction of a card even if thattransaction is older than 6 months.For example,A card has 10 transactions and all of them are older than 6 months. I have to keep the latest transaction and delete the other 9 transactions.What is the best and fast way to do this task?Best regards.Vahit KIS"
You haven't posted DDL so I can't write the exact DML statement for you, but generally:delete transactionsfrom transactions twhere datediff( m, trandate, current_timestamp ) >= 6 and exists (select 1from transactionswhere accountno = t.accountno and trandate > t.trandate )in pseudo-sql: delete transactions older than 6 months where there exists a more recent transaction for the same account.Jonathan Boott, MCDBA |
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Table cleanup