SQL>
SQL> CREATE TABLE account_transaction
2 (transaction_id NUMBER NOT NULL PRIMARY KEY,
3 account_id NUMBER NOT NULL,
4 transaction_type VARCHAR2(3) NOT NULL,
5 transaction_amount NUMBER NOT NULL,
6 comments VARCHAR2(30));
Table created.
SQL>
SQL> CREATE OR REPLACE TRIGGER validate_update
2 BEFORE UPDATE ON account_transaction
3 FOR EACH ROW
4 BEGIN
5 IF UPDATING('ACCOUNT_ID') THEN
6 DBMS_OUTPUT.put_line ('ERROR');
7 END IF;
8 END;
9 /
Trigger created.
SQL> show error
No errors.
SQL>
SQL> drop table account_transaction;
Table dropped.
SQL>