Quick question about System Change Number(SCN) in FlashBack Query topic

i know tht we can get the SCN of the database using flashback concept as follows
SQL> execute :myvariable:=dbms_flashback.get_system_change_number();
PL/SQL procedure successfully completed.
SQL> print myvariable;
MYVARIABLE
451578
for example i made some insertions into a table after this and commit is executed. If i want to rollback this transaction thn i can use
SQL> execute dbms_flashback.enable_at_system_change_number(:myvariable);
PL/SQL procedure successfully completed.
but what if i dont know the SCN of the database before the transaction(insertion in to the table). If i want to rollback the database to state where i don't know the SCN of that particular state, thn how can i do tht.
i know tht we can do it using timestamp method....but i want to know how we can use this SCN concept in this situation.
Thanks in advance....

Maybe you can use [ FLASHBACK_TRANSACTION_QUERY|http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_4186.htm#i1628130] view .

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First Question 1)
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