Software Applications Programming Errors and solutions.

1.Create  or replace trigger before insert on field in sql Create or replace trigger t1 Before insert on Employee For each row declare v_firstname Employee.firstname%type; v_lastname Employee.lastname%type; Begin DBMS_OUTPUT.PUT_LINE('You inserted the first Name:'|| :NEW.FIRSTNAME); DBMS_OUTPUT.PUT_LINE('You inserted the first Name:'|| :NEW.LASTNAME); Begin select distinct firstname into v_firstname from Employee where firstname=:NEW.FIRSTNAME; IF(:NEW.FIRSTNAME = v_firstname) THEN DBMS_OUTPUT.PUT_LINE('This first name exists already in the table Employee.'); end if; exception when no_data_found then DBMS_OUTPUT.PUT_LINE('This first name does not exist in the table Employee.'); End; Begin select distinct lastname into v_lastname from Employee where lastname=:NEW.lastNAME; IF(:NEW.LASTNAME = v_lastname) THEN DBMS_OUTPUT.PUT_LINE('This last name exists already in the table Employee....

Example of trigger using procedure language CREATE OR REPLACE TRIGGER Trig_test AFTER INSERT ON EMP1 FOR EACH ROW DECLARE PRAGMA AUTONOMOUS_TRANSACTION; BEGIN test_T; -- Test_T is a Procedure commit; END Trig_test create or replace procedure test_T AS declare v_empno emp.EMPNO%type; cursor c1 is select empno from emp1 where empno is null; BEGIN open c1;loop fetch c1 into v_empno; exit when c1%notfound; update emp1 set empno = empno_seq.nextval where empno is null; end loop; close c1; Exception when others then null; end;