Retrieve the records based on date where date is not stored

Hi,
I have one table in Oracle.
I want to retrieve the records which are added or modified after a particular date & time.(but the table does not contain any column for date & time )
For example: Product table(pid number,pname varchar2)
i am entering 10 records on date 21/07/2005
i am entering 20 records on date 22/07/2005
i am entering 15 records on date 23/07/2005
i am entering 30 records on date 24/07/2005
If i want to retrieve the records added after 22/7/2005
(ie.) last 45 records
But the table does not contain any date field.
How will you know date & time of each record updated in the table.
If any one knows, help me.
bye.

for 9iR2: check out online document of Oracle9i Application Developer's Guide - Fundamentals and search flash back query
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg08sql.htm#10851
for 10G, flash back feature is enhenced to whole database level, you can still use flash back query though.

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i have a formula self-organizing maps
this formula is looking for D1, D1 is neuron index that will be searched for the smallest value.and the result are D1=2 ,D2=5, D3=17 from calculating with formula .it means the smallest value is 2, "2" from weight [2 2] in file attached.
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weight.txt ‏1 KB
data .txt ‏1 KB

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Retrieve the records based on date where date is not stored

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