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Oracle9i program with pl/sql Sample Questions:

1. Which statements are true? (Choose all that apply)

A) If errors occur during the compilation of a trigger you can go into SQL *Plus and query the USER_TRIGGERS data dictionary view to see the compilation errors.
B) If errors occur during the compilation of a trigger you can use the SHOW ERRORS command within iSQL *Plus to see the compilation errors.
C) If errors occur during the compilation of a trigger, the trigger is still created.
D) If errors occur during the compilation of a trigger you can go into SQL *Plus and query the USER_ERRORS data dictionary view to see compilation errors.

2. Examine the trigger:
CREATE OR REPLACE TRIGGER Emp_count
AFTER DELETE ON Emp_tab
FOR EACH ROW
DELCARE
n INTEGER;
BEGIN
SELECT COUNT(*)
INTO n
FROM Emp_tab;
DBMS_OUTPUT.PUT_LINE(' There are now ' || a ||
' employees,');
END;
This trigger results in an error after this SQL statement is entered:
DELETE FROM Emp_tab WHERE Empno = 7499;
How do you correct the error?

A) Change the trigger to a statement-level trigger by removing FOR EACH ROW.
B) Remove the DBMS_OUTPUT statement because it is not allowed in a trigger.
C) Change the trigger type to a BEFORE DELETE.
D) Take out the COUNT function because it is not allowed in a 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 = 10;
C) UPDATE employees
SET department_id = change_dept(10, 'Finance')
Where department_id = DEPARTMENTS:CURRVAL;
D) UPDATE departments
SET department_id = change_dept(10, 'Finance')
Where department_id = 10;

4. Which two statements describe the state of a package variable after executing the package in which it is declared? (Choose two)

A) It persists from user to user when the package is invoked.
B) It does not persist from session to session for the same user.
C) It persists across transactions within a session.
D) It does not persist across transaction within a session.
E) It persists from session to session for the same user.

5. You want to create procedures, functions and packages Which privilege do you need?

A) CREATE PROCEDURE system privilege
B) CREATE PACKAGE system privilege
C) EXECUTE CODE object privilege
D) CREATE ANY CODE object privilege
E) CREATE FUNCTION, CREATE PROCEDURE, CREATE PACKAGE system privileges

Solutions: