Query based on main table and audit table

Question

Hi,
I had created auditing on some table. Values might not change and if they changed, it should be stored in audit table.
I want to get the values in the table a on real time basis, like dimentions in datawarehouse.
Trying to write a query based on table a and aud_a to get point-in-time or values at anytime in the past.
Something like
SELECT *
FROM a (table_name)
WHERE effective_from >= $DATE_TO_QUERY
AND effective_to < $DATE_TO_QUERY
How to get this kind of query .
Please help. ( Table structure for table a and audit table aud_a and trigger aud_tg_a given below)
Giving code as follows.
main table a
create table a
( val1 number,
val2 number,
update_by varchar2(30),
date_updated date);
creare auidt table aud_a
create table aud_a
( "AUDIT_SEQ" NUMBER,
"AUDIT_TRAN_ID" NUMBER,
"AUDIT_PROG_ID" VARCHAR2(30 BYTE),
"AUDIT_TERMINAL" VARCHAR2(16 BYTE),
"AUDIT_REASON" VARCHAR2(30 BYTE),
"AUDIT_ACTION" CHAR(1 BYTE),
"AUDIT_ACTION_BY" VARCHAR2(20 BYTE),
"AUDIT_ACTION_DT" DATE,
val1 number,
val2 number,
updated_by varchar2(30),
date_updated date);
trigger on  table a to populate aud_a
CREATE OR REPLACE TRIGGER aud_tg_a AFTER
INSERT OR
DELETE OR
update on a
for each row
declare
v_time_now DATE;
v_terminal VARCHAR2(16);
v_tran_id NUMBER;
v_prog_id VARCHAR2(30);
V_reason VARCHAR2(30);
BEGIN
v_time_now := sysdate;
v_terminal := userenv('TERMINAL');
v_tran_id := 1;
v_prog_id := 'test';
v_reason := 'AUDIT';
IF inserting THEN
INSERT
INTO a
audit_seq,
AUDIT_tran_id,
AUDIT_prog_id,
AUDIT_reason,
AUDIT_terminal,
AUDIT_action_by,
AUDIT_action_dt,
AUDIT_action ,
val1,
val2,
updated_by,
date_updated
VALUES
s_audit_no.nextval,
v_tran_id,
v_prog_id,
v_reason,
v_terminal,
USER,
v_time_now,
'I' ,
:new.val1,
:new.val2,
:new.updated_by,
:new.date_updated
elsif deleting THEN
INSERT
INTO a
audit_seq,
AUDIT_tran_id,
AUDIT_prog_id,
AUDIT_reason,
AUDIT_terminal,
AUDIT_action_by,
AUDIT_action_dt,
AUDIT_action ,
us_agy_backed_id,
industry_subgroup,
comments,
updated_by,
date_updated
VALUES
s_audit_no.nextval,
v_tran_id,
v_prog_id,
v_reason,
v_terminal,
USER,
v_time_now,
'D' ,
:old.val1,
:old.val2,
:old.comments,
:old.updated_by,
:old.date_updated
elsif updating THEN
INSERT
INTO a
audit_seq,
AUDIT_tran_id,
AUDIT_prog_id,
AUDIT_reason,
AUDIT_terminal,
AUDIT_action_by,
AUDIT_action_dt,
AUDIT_action ,
us_agy_backed_id,
industry_subgroup,
comments,
updated_by,
date_updated
VALUES
s_audit_no.nextval,
v_tran_id,
v_prog_id,
v_reason,
v_terminal,
USER,
v_time_now,
'U' ,
:new.val1,
:new.val2,
:new.updated_by,
:new.date_updated
END IF;
END;
-------------------------

Answer 1

Hi hoek,
I am not able to use Oracle's audit functionality becuase I need to trap some changes in particular tables and then rebuild query if required.
Thanks for your suggestion though.
Regards,
Milind