> I find myself in a situation where I need to delete large amount of data > from a huge (comparably) table, with relatively complex criteria on what > stays and what gets deleted: > > - The table in question has about 6 million rows. > - The rows contain a mix of integer, timestamp and blob columns, with > primary key A (integer) and secondary keys B (integer), C (integer) and > D (timestamp). > - I want to keep at least one record for every combination of B and C: > a) the newest (HAVING D = MAX(D)) > b) within the last 30 days ((D+30)> 'now')
Forgot to mention: the table and its indexes amount to some 10 GB or so. Pepak ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Resources item on the main (top) menu. Try Knowledgebase and FAQ links ! Also search the knowledgebases at http://www.ibphoenix.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
