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Oracle9i program with pl/sql Sample Questions:

1. You need to remove the database triggerBUSINESS_HOUR.Which command do you use to remove the trigger in the SQL *Plus environment?

A) DELETE FROM USER_TRIGGERS
WHERE TRIGGER_NAME = 'BUSINESS_HOUR';
B) ALTER TRIGGER business_hour REMOVE;
C) DELETE TRIGGER business_hour;
D) DROP TRIGGER business_hour;
E) REMOVE TRIGGER business_hour;

2. Examine this code:
CREATE OR REPLACE TRIGGER secure_emp BEFORE LOGON ON employees BEGIN IF (TO_CHAR(SYSDATE, 'DY') IN ('SAT', 'SUN')) OR (TO_CHAR(SYSDATE, 'HH24:MI') NOT BETWEEN '08:00' AND '18:00') THEN RAISE_APPLICATION_ERROR (-20500, 'You may insert into the EMPLOYEES table only during business hours.'); END IF; END; / What type of trigger is it?

A) DML trigger
B) INSTEAD OF trigger
C) This is an invalid trigger.
D) Application trigger
E) System event trigger

3. Examine this code CREATE OR REPLACE FUNCTION change_dept (p_old_id NUMBER, p_deptname VARCHAR2) RETURN NUMBER IS V_new_id NUMBER; BEGIN SELECT departments_seq.nextval INTO v_new_id FROM dual; UPDATE departments SET departmenet_id = v_new_id, Department_name = p_deptname WHERE department_id = p_old_id; Return v_new_id; END; /
There are no foreign key integrity constraints on the EMPLOYEES and DEPARTMENTS tables. Which statement performs a successful update to the EMPLOYEES table?

A) UPDATE departments
change_dept(270, 'Outsource')
Where department_name = 'payroll';
B) UPDATE employees
SET department_id = change_dept(10, 'Finance')
Where department_id = DEPARTMENTS:CURRVAL;
C) UPDATE employees
SET department_id = change_dept(10, 'Finance')
Where department_id = 10;
D) UPDATE departments
SET department_id = change_dept(10, 'Finance')
Where department_id = 10;

4. Examine this code:
CREATE OR REPLACE FUNCTION calc_sal(p_salary NUMBER)
RETURN NUMBER
IS
v_raise NUMBER(4,2) DEFAULT 1.08;
BEGIN
RETURN v_raise * p_salary;
END calc_sal;
/
Which statement accurately call the stored function CALC_SAL? (Choose two)

A) DELETE FROM employees(calc_sal(salary))
WHERE calc_sal(salary) > 1000;
B) SELECT salary, calc_sal(salary)
FROM employees
WHERE department_id = 60;
C) UPDATE employees (calc_sal(salary))
SET salary = salary * calc_sal(salary);
D) SELECT last_name, salary, calc_sal(salary)
FROM employees ORDER BY
calc_sal(salary);
E) INSERT calc_sal(salary) INTO employees
WHERE department_id = 60;

5. You have an AFTER UPDATE row-level on the table EMP. The trigger queries the EMP table and inserts the updating user's information into the AUDIT_TABLE.
What happens when the user updates rows on the EMP table?

A) A runtime error occurs. The update on the EMP table does not take place, but the insert into the AUDIT_TABLE occurs.
B) A runtime error occurs. The effect of trigger body is rolled back, but the update on the EMP table takes place.
C) The trigger fires successfully. The update on the EMP table occurs, and data is inserted into theAUDIT_TABLE table.
D) A runtime error occurs. The effect of trigger body and the triggering statement are rolled back.
E) A compile time error occurs.

Solutions: