Are you looking for statistics or the actual prior versions of
rows?
I'm looking for actual versions of row data. What I want to
achieve as a final result is a kind of data change history.
We just use ON DELETE rules on the tables where we want to maintain a history. In most cases, we just copy the old record to the archive table which has an additional timestamp column with a default of NOW() to indicate the date of archival. In one case, where the table schema is large, changes are "frequent" and the changes are often minimal, we only archive a small subset of data based on what is changing. If the changes affect columns outside of the small subset, then we archive the whole record.
Bill MacArthur
* Make that ON DELETE and ON UPDATE :)
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