--建立測試表
CREATE TABLE test(
 ID  VARCHAR2(15),
  NAME  VARCHAR2(15)
);
--建立記錄測試表
CREATE TABLE test_log(
  ID  VARCHAR2(15),
  NAME  VARCHAR2(15)
);

CREATE OR REPLACE TRIGGER trgdemo
   AFTER INSERT OR UPDATE OR DELETE
   ON TEST FOR EACH ROW
BEGIN     
IF INSERTING THEN
        INSERT INTO test_log VALUES
 
(:new.ID,:new.NAME); 
    ELSIF UPDATING THEN
        update test_log  SET NAME = :new.NAME WHERE ID=:new.ID;
    ELSIF DELETING THEN
       delete test_log where ID = :old.ID; 
   END IF;END;

--下面我們來分別執行DML語句
INSERT INTO test VALUES('zhang','a');
INSERT INTO test VALUES('wang','b');
INSERT INTO test VALUES
 
('li','c');
INSERT INTO test VALUES('zhao','d');
UPDATE test SET NAME = 'A' WHERE ID = 'zhang';
UPDATE test SET NAME = 'B' WHERE ID = 'wang';
UPDATE test SET NAME = 'C' WHERE ID = 'li';
UPDATE test SET NAME = 'D' WHERE ID = 'zhao';
DELETE test WHERE ID = 'zhang';
DELETE test WHERE ID = 'li';
--然後檢視效果
 

SELECT * FROM test;
SELECT * FROM test_log;