Check the constraint on the table but to apply only to certain lines?

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  Hi Experts,
  
  Could someone help me with the following problem.
  We strive to implement the function of 'check' on a table. What is the best way to do audits? (keep track of any changes in the table)
  That's what we do...
  

    Main_table
    id
    first_name
    last_name
     dob
    hire_date
    created_date
    created_by
    updated_date
    updated_by
  
  
    audit_table
    ad_action (whether it is insert,update or delete)
    ad_time (time)
    ad_user (whos is the user)
    id 
    first_name
    last_name
     dob
    hire_date
    created_date
    created_by
    updated_date
    updated_by
  
  and i have a trigger on the "main_table" like this
  
  
    CREATE OR REPLACE TRIGGER Main_table_AIUD after
  insert or update or delete on Main_table for each row
  begin
     declare
        ljn_action varchar2(3);
     begin
        if inserting then
           ljn_action := 'INS';
        elsif updating then
           ljn_action := 'UPD';
        else
           ljn_action := 'DEL';
        end if;
        --
        if inserting  then
           insert into audit_table
           (
            ad_action,
            ad_time,
            ad_user, 
            id 
            first_name
           last_name
           dob
           hire_date
           created_date
           created_by
           updated_date
           updated_by
           )
           values
           (
            ljn_action
           ,sysdate
           ,nvl(v('APP_USER') ,USER)
           :new.id,
          :new.first_name,
           :new.last_name,
            :new.dob,
           :new.hire_date,
           :new.created_date,
           :new.created_by,
           :new.updated_date,
            :new.updated_by
           );
        elsif updating then
          insert into audit_table
           (
            ad_action,
            ad_time,
            ad_user, 
            id 
            first_name
           last_name
           dob
           hire_date
           created_date
           created_by
           updated_date
           updated_by
           )
           values
           (
            ljn_action
           ,sysdate
           ,nvl(v('APP_USER') ,USER)
           :old.id,
          :old.first_name,
           :old.last_name,
            :old.dob,
           :old.hire_date,
           :old.created_date,
           :old.created_by,
           :old.updated_date,
            :new.updated_by
           );
        else
           insert into audit_table
           (
            ad_action,
            ad_time,
            ad_user, 
            id 
            first_name
           last_name
           dob
           hire_date
           created_date
           created_by
           updated_date
           updated_by
           )
           values
           (
            ljn_action
           ,sysdate
           ,nvl(v('APP_USER') ,USER)
           :old.id,
          :old.first_name,
           :old.last_name,
            :old.dob,
           :old.hire_date,
           :old.created_date,
           :old.created_by,
           :old.updated_date,
            :new.updated_by
           );
        end if;
     end;
  end;
  /

  For "Insert" and "Delete" as I need to enter all parts of my code would be ok.
  
  But for "update" How can I capture only the columns that have changed? and put it in the audit table
  so next time if I go to the audit table, I see clearly that these elements had changes.
  
  Is there a better way to do it?
  
  Please let me know
  
  Thank you

  Marella Phani wrote:
  (3) if it is an action "update" on a table. How do we know the data of 'old' and 'new data' in the audit tables?

  It is value according to the audit. And like many, I know, unfortunately, the only way to do so far is triggers.

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  http://Apex.Oracle.com/pls/Apex/f?p=31517:1
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  Published by: user11181920 on October 23, 2012 11:15