http://docs.oracle.com/cd/B19306_01/appdev.102/b14251/adfns_flashback.htm#sthref1476


flashback version query - returns all instances of a row(s) over a period of time. It lets you ask "show me all of the committed versions of this record(s) between X and Y points in time"

If you updated and committed the record 5,000 times between X and Y, you'll get 5,000 records.

If you didn't update the record, you'll get 1 row back.



flashback transaction - returns the DML necessary to logically undo the work of a given TRANSACTION. If a transaction inserted a record, updated 3 records and deleted 5 records - flashback transaction query would show you need to insert 5 records (to undelete), update three records (to un-update), and delete a record (to un-insert)