What is undo statement in oracle

hi,
i`m not clear idea about undo statement,

There is no undo statement in SQL but Oracle manages undo data.
However some views related to LogMiner and Flashback features display an undo statement: in this case the undo statement is the SQL statement that should be run to undo the original SQL statement. See for example UNDO_SQL column in FLASHBACK_TRANSACTION_QUERY view http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_4186.htm#i1628130.
Edited by: P. Forstmann on 12 févr. 2011 09:47

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