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But 'before update' and 'after update' statement level events are fired only once per sql statement.The above rules apply similarly for INSERT and DELETE statements.A trigger is a pl/sql block structure which is fired when a DML statements like Insert, Delete, Update is executed on a database table.A trigger is triggered automatically when an associated DML statement is executed.DEPTNO; EXCEPTION WHEN NO_DATA_FOUND THEN INSERT INTO DEPT_TEST VALUES (Dept_Sequence. Department) RETURNING DEPTNO INTO V_ID; END; INSERT INTO EMP_TEST (ID, NAME, DEPTNO) VALUES (Emp_Sequence. NAME, V_ID); END Updte Emp Dept; CREATE OR REPLACE TRIGGER Updte Emp Dept 2 INSTEAD OF INSERT ON EMP_DEPT_INFO 3 DECLARE 4 V_ID 5 DEPT_TEST.DEPTNO%TYPE; 6 BEGIN 7 BEGIN 8 SELECT DEPTNO INTO V_ID 9 FROM DEPT_TEST WHERE DEPTNO= 10 :new.We can use the data dictionary view 'USER_TRIGGERS' to obtain information about any trigger.The below statement shows the structure of the view 'USER_TRIGGERS' NAME Type -------------------------------------------------------- TRIGGER_NAME VARCHAR2(30) TRIGGER_TYPE VARCHAR2(16) TRIGGER_EVENT VARCHAR2(75) TABLE_OWNER VARCHAR2(30) BASE_OBJECT_TYPE VARCHAR2(16) TABLE_NAME VARCHAR2(30) COLUMN_NAME VARCHAR2(4000) REFERENCING_NAMES VARCHAR2(128) WHEN_CLAUSE VARCHAR2(4000) STATUS VARCHAR2(8) DESCRIPTION VARCHAR2(4000) ACTION_TYPE VARCHAR2(11) TRIGGER_BODY LONG This view stores information about header and body of the trigger.


1) Row level trigger - An event is triggered for each row upated, inserted or deleted.

2) Statement level trigger - An event is triggered for each sql statement executed.

SQL CREATE or REPLACE TRIGGER 2 After_Update_Row_product 3 AFTER 4 UPDATE On Product 5 FOR EACH ROW 6 BEGIN 7 INSERT INTO product_check 8 Values ('After update, Row level', Sysdate); 9 END; 10 / Trigger created.

SELECT * From PRODUCT; PRODUCT_ID PRODUCT_NAME SUPPLIER_NAME UNIT_PRICE ---------- -------------------------------- -------------------------------- ---------- 1001 Samsung Flipkart 34000 1002 LG Flipkart 12000 1003 Apple Amazon 54000 1004 i Phone7 Amazon 54000 SQL SELECT * FROM PRODUCT_CHECK; MESSAGE CURRENT_D -------------------------------------------------- --------- Before update, statement level 02-NOV-16 Before update row level 02-NOV-16 After update, Row level 02-NOV-16 Before update row level 02-NOV-16 After update, Row level 02-NOV-16 After update, statement level 02-NOV-16 12 rows selected.

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