Say table1 has more then 500000 records, and there is a second table tmp_keep with the ids of the records in table1 to be kept, the rest need to be deleted. The number of records in tmp_keep can vary from 0 to all the records in table1, with any values in between.
What is the best strategy for doing the deletion? For deleting a large number of records (tmp_keep is small), this works fine: DELETE FROM table1 WHERE id1 NOT IN (SELECT id1 FROM tmp_keep); But this becomes inefficient when tmp_keep is large. Any suggestions? _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
