Column level trigger

Hi All -
I have a table which has 6 columns
create table main_tbl
(p_id integer,
p_lname varchar2(20),
p_fname varchar2(20),
p_dept varchar2(15),
p_office varchar2(15),
p_ind char(1)
And I have a corresponding audit/history table
create table main_tbl_audit
(p_id integer,
p_lname varchar2(20),
p_fname varchar2(20),
p_dept varchar2(15),
p_office varchar2(15),
p_ind char(1)
As part of the application audit process, I want to move a record from main_tbl to main_tbl_audit only when a column value changes. I can do this using a column level trigger but if I use column level trigger and if for example 3 values are changed in the main_tbl at once then it will create 3 different rows in the main_tbl_audit table.
Is there a way to always create one row in main_tbl_audit table even if a record in the main_tbl table has one or more column value changes.
Please share your expertise.
Thanks,
Seenu001

I'm not quite sure what you mean by a "column-level trigger" since there is no such thing in Oracle. You can specify a list of columns in the OF clause of a row-level trigger, so I'm guessing that's what you're talking about. But then I don't understand why you would get three rows in the audit table. Unless you created three different row-level triggers each of which specified a single column?
Why wouldn't you simply have a single row-level trigger that compared the old and new values, i.e. (ignoring NULLs)
CREATE OR REPLACE TRIGGER trg_audit_main
BEFORE UPDATE ON main_tbl
FOR EACH ROW
BEGIN
IF( :new.p_lname != :old.p_lname or
:new.p_fname != :old.p_fname or
THEN
INSERT INTO main_tbl_audit ...
END IF;
END;Justin

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798616 wrote:
Hi Experts,
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