update change the date with sysdate column

Hello
I want to add a new column, modify_date, to an existing table.

This column must have sysdate when ever a record is updated.

Please let me know the best way to do this same thing.

Trigger? I think that some problem of mutation?

Thanks and greetings

Use a before update trigger and set the: new.modify_date such as SYSDATE.

SQL> create table t(no number, last_updated date)
  2  /

Table created.

SQL> insert into t values(1,'')
  2  /

1 row created.

SQL> commit
  2  /

Commit complete.

SQL> edit
Wrote file afiedt.buf

  1  create or replace trigger t_trig before update on t for each row
  2  begin
  3     :new.last_updated := sysdate;
  4* end;
SQL> /

Trigger created.

SQL> update t set no = 2 where no = 1
  2  /

1 row updated.

SQL> select * from t
  2  /

        NO LAST_UPDA
---------- ---------
         2 04-DEC-08

Tags: Database

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