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Oracle9i program with pl/sql Sample Questions:

1. Examine this code:
CREATE OR REPLACE TRIGGER update_emp
AFTER UPDATE ON emp
BEGIN
INSERT INTO audit_table (who, dated)
VALUES (USER, SYSDATE);
END;
You issue an UPDATE command in the EMP table that results in changing 10 rows.
How many rows are inserted into the AUDIT_TABLE?

A) 1
B) A value equal to the number of rows in the EMP table.
C) None
D) 10

2. You have the following table:
CREATE TABLE Emp_log ( Emp_id NUMBER Log_date DATE, New_salary NUMBER, Action VARCHAR(20));
You have the following data in the EMPLOYEES table:
EMPLOYEE_ID LAST_NAME SALARY DEPARTMENT_ID
100 King 24000 90 101 Kochhar 17000 90 102 De Haan 17000 90 103 Hunold 9000 60 104 Ernst 6000 60 105 Austin 4800 60 106 Pataballa 4800 60 107 Lorentz 4200 60 108 Greenberg 12000 100 201 Hartstein 13000 20 202 Fay 6000 20
You create this trigger:
CREATE OR REPLACE TRIGGER Log_salary_increase AFTER UPDATE ON employees FOR EACH ROW WHEN (:new.Salary > 1000) BEGIN INSERT INTO Emp_log (Emp_id, Log_date, New_Salary, Action) VALUES (new.Employee_id, SYSDATE, :new.SALary, 'NEW SAL'); END /
Then, you enter the following SQL statement:
UPDATE Employee SET Salary = Salary + 1000.0 Where Department_id = 20M
What are the result in the EMP_LOG table?
A EMP_ID LOG_DATE NEW_SALARY ACTION
201 24-SEP-02 13000 NEW SAL 202 24-SEP-02 600 NEW SAL

A) EMP_ID LOG_DATE NEW_SALARY ACTION
201 24-SEP-02 NEW SAL 202 24-SEP-02 NEW SAL
B) No rows are inserted.
C) EMP_ID LOG_DATE NEW_SALARY ACTION
201 24-SEP-02 14000 NEW SAL 202 24-SEP-02 7000 NEW SAL

3. Examine this package
CREATE OR REPLACE PACKAGE discounts
IS
g_id NUMBER := 7839;
discount _rate NUMBER := 0.00;
PROCEDURE display_price (p_price NUMBER);
END discounts;
/
CREATE OR REPLACE PACKAGE BODY discounts
IS
PROCEDURE display_price (p_price NUMBERI)
IS
BEGIN
DBMS_OUTPUT.PUT LINE ( 'Discounted '||
TO_CHAR(p_price*NVL(dlscount_rate, 1)));
END display_price;
BEGIN
Discount_rate = 0.10;
END discounts;
/
The SQL*Plus SERVEROUTPUT setting is turned on in your session. You execute the procedure
DISPLAY_PRICE from SQL*Plus with the command EXECUTE discounts. display_price (100);
What is the result?

A) Discounted 100
B) Discounted 10
C) Discounted 0.10
D) Discounted 0.00
E) Discounted NULL

4. Which two statements about functions are true? (Choose two.)

A) A function must have a return statement in its body to execute successfully
B) A stored function that is called from a SOL statement can return a value of any PL/SOL variable data type
C) From SOL*Plus, a function can be executed by giving the command EXECUTE functionname;
D) A stored function increases efficiency of queries by performing functions on the server rather than in the application
E) Client-side functions can be used in SOL statements

5. You want to create a PL/SQL block of code that calculates discounts on customer orders. -This code will be invoked from several places, but only within the program unit ORDERTOTAL. What is the most appropriate location to store the code that calculates the discounts?

A) A block of code in the body of the program unit ORDERTOTAL.
B) A local subprogram defined within the program unit ORDERTOTAL.
C) A stored procedure on the server.
D) A standalone procedure on the client machine.
E) A block of code in a PL/SQL library.

Solutions: