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  • +1 This too is a common technique which can be employed via table triggers to throw a record into a history table which can then be delta'd. Some RDBMSs (e.g. Oracle's Flashback feature) also support the use of point in time queries where the state of the data at some point in the past can be inspected. Commented Jan 29, 2014 at 13:12
  • would a simple solution be to save any query that updates and table to a log? Commented Jan 29, 2014 at 13:33
  • That is another way although it might become unwieldy for tables with a high volume/frequency of updates. Making it an external table could head off some of the problems though... Commented Jan 29, 2014 at 13:50