How to create hidden column in Oracle Table

Hi folks
i have one doubt regarding hidden column creation in Oracle Table..
Let me briefly explain my requirements.
I have one table called UWRMC_MAST is table contain the following columns
        RMC_N_ID           NUMBER(10)                    NOT NULL,
     COB_N_ID           NUMBER(2)                      NOT NULL,
     SUBCOB_N_ID     NUMBER(2),
     RMC_C_CODE      VARCHAR2(10 BYTE)         NOT NULL,
     RMC_C_NAME      VARCHAR2(100 BYTE)       NOT NULL,
     CREATED_N_BY   NUMBER(10)                     NOT NULL,
     CREATED_D_DT   DATE                              NOT NULL,
     MODIFIED_N_BY NUMBER(10)                     NOT NULL,
     MODIFIED_D_DT DATE                              NOT NULL,
     RECORD_N_STS   NUMBER(1)                      NOT NULL,
     RMC_C_REMARKS VARCHAR2(256 BYTE),
     EFFECT_D_DT     DATE                           NOT NULL
RMC_N_ID is primary key
i want to create one column like Old_EFFECT_D_DT as virtual column
when ever i update the effective date that date should be insert into Old_EFFECT_D_DT i.e., Virtual Column
For example
SQL> select RMC_N_ID, COB_N_ID, SUBCOB_N_ID, RMC_C_CODE, EFFECT_D_DT from uwrmc_mast;
RMC_N_ID   COB_N_ID SUBCOB_N_ID RMC_C_CODE EFFECT_D_
        46          1          74 PCTMOTR    02-FEB-11
Below i update the effective date(01-feb-2011
SQL> update uwrmc_mast
2 set EFFECT_D_DT = '01-apr-2011'
3 where rmc_n_id =46;
1 row updated.
But i want a result like below
SQL> select RMC_N_ID, COB_N_ID, SUBCOB_N_ID, RMC_C_CODE, EFFECT_D_DT from uwrmc_mast;
RMC_N_ID   COB_N_ID SUBCOB_N_ID RMC_C_CODE EFFECT_D_   OLD_EFFE
        46          1          74 PCTMOTR    01-APR-11   02-FEB-11Is this possible to do in oracle , kindly give a solution for my requirement
Regards
Arun

Arun wrote:
Hi Mr.David_Aldridge
Am having the doubt that's why i posted my quires in oracle forums.. just i want to know whether my requirement suit for VIRTUAL COLUMN in Table.
Regards,
ArunWell, I'm not sure exactly what your requirement is.
If you want to audit changes to the records of that table then it would be better to use Oracle's auditing facility. If this previous change date is really a required part of your actual application functionality then you might use the application itself to maintain the previous date as a column in the table, as you say, or if you need to maintain the history of changes then add a new table so you can keep track of multiple changes.

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