Use this statement to undo any changes made in a trigger.
ROLLBACK TRIGGER [ WITH raiserror-statement ]
The ROLLBACK TRIGGER statement rolls back the work done in a trigger, including the data modification that caused the trigger to fire.
Optionally, a RAISERROR statement can be issued. If a RAISERROR statement is issued, an error is returned to the application. If no RAISERROR statement is issued, no error is returned.
If a ROLLBACK TRIGGER statement is used within a nested trigger and without a RAISERROR statement, only the innermost trigger and the statement which caused it to fire are undone.
SQL/2003 Transact-SQL extension.