SQL> CREATE TABLE emp (
2 id NUMBER PRIMARY KEY,
3 fname VARCHAR2(50),
4 lname VARCHAR2(50)
5 );
Table created.
SQL>
SQL> INSERT INTO emp (id, fname, lname)VALUES (1, 'A', 'B');
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (2, 'C', 'D');
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (3, 'E', 'F');
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (4, 'G', 'H');
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (5, 'G', 'Z');
1 row created.
SQL>
SQL>
SQL> SET SERVEROUTPUT ON
SQL>
SQL>
SQL> CREATE OR REPLACE TRIGGER emp_trig
2 BEFORE UPDATE OF fname
3 ON emp
4 FOR EACH ROW
5 BEGIN
6 DBMS_OUTPUT.PUT_LINE('First Name '||:OLD.fname||' has change to '||:NEW.fname);
7 END;
8 /
Trigger created.
SQL>
SQL>
SQL> SELECT trigger_name, status FROM user_triggers;
TRIGGER_NAME STATUS
------------------------------ --------
EMP_TRIG ENABLED
INVENTORY_TRG DISABLED
DEMO_BIFER DISABLED
DEPT_SAL_TRG DISABLED
SYSTEMALTERUSER DISABLED
USAGE_START DISABLED
USAGE_STOP DISABLED
USER_LOGON_MODULE_CHECK DISABLED
8 rows selected.
SQL>
SQL> drop table emp;
Table dropped.
SQL>