Oracle pl sql trigger updating smack the pony dating agency

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.

DEPTNO%TYPE; BEGIN BEGIN SELECT DEPTNO INTO V_ID FROM DEPT_TEST WHERE DEPTNO= :new.

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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