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Oracle9i program with pl/sql Sample Questions:

1. Examine this code:
CREATE OR REPLACE PROCEDURE audit_action (p_who VARCHAR2) AS BEGIN INSERT INTO audit(schema_user) VALUES(p_who); END audit_action; /
CREATE OR REPLACE TRIGGER watch_it AFTER LOGON ON DATABASE CALL audit_action(ora_login_user) / What does this trigger do?

A) The trigger invokes the procedure audit_action each time a user logs on to the database and adds the username to the audit table.
B) The trigger marks the user as logged on to the database before an audit statement is issued.
C) The trigger records an audit trail when a user makes changes to the database.
D) The trigger invoked the procedure audit_action each time a user logs on to his/her schema and adds the username to the audit table.

2. Examine this package:
CREATE OR REPLACE PACKAGE pack_cur
IS
CURSOR c1 IS
SELECT prodid
FROM product
ORDER BY prodid DESC;
PROCEDURE proc1;
PROCEDURE proc2;
END pack_cur;
/
CREATE OR REPLACE PACKAGE BODY pack_cur
IS
v_prodif NUMBER;
PROCEDURE proc1 IS
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO v_prodid;
DBMS_OUTPUT.PUT_LINE('Row is: ' || c1%ROWCOUNT);
EXIT WHEN c1%ROWCOUNT >= 3;
END LOOP;
END proc1;
PROCEDURE proc2 IS
BEGIN
LOOP
FETCH c1 INTO v_prodid;
DBMS_OUTPUT.PUT_LINE('Row is: ' ||c1%ROWCOUNT);
EXIT WHEN c1%ROWCOUNT >= 6;
END LOOP;
CLOSE c1;
END proc2;
END pack_cur;
/
The product table has more than 1000 rows. The SQL*Plus SERVEROUTPUT setting is turned on
in your session.
You execute the procedure PROC1 from SQL *Plus with the command:
EXECUTE pack_cur.PROC1;
You then execute the procedure PROC2 from SQL *Plus with the command:
EXECUTE pack_cur.PROC2;
What is the output in your session from the PROC2 procedure?

A) Row is: 4 Row is: 5 Row is: 6
B) Row is: Row is: Rows is:
C) ERROR at line 1:
D) Row is: 1 Row is: 2 Row is: 3

3. How can you migrate from a LONG to a LOB data type for a column?

A) You cannot migrate from a LONG to a LOB date type for a column.
B) Use the DBMS_MANAGE_LOB.MIGRATE procedure.
C) Use the UTL_MANAGE_LOMIGRATE procedure.
D) Use the ALTER TABLE command.
E) Use the DBMS_LOB.MIGRATE procedure.

4. You have a row level BEFORE UPDATE trigger on the EMP table. This trigger contains a SELECT statement on the EMP table to ensure that the new salary value falls within the minimum and maximum salary for a given job title.
What happens when you try to update a salary value in the EMP table?

A) The trigger fails because a SELECT statement on the table being updated is not allowed.
B) The trigger fires successfully.
C) The trigger fails because it needs to be a row level AFTER UPDATE trigger.
D) The trigger fails because you cannot use the minimum and maximum functions in a BEFORE UPDATE trigger.

5. Examine this function:
CREATE OR REPLACE FUNCTION CALC_PLAYER_AVG (V_ID in PLAYER_BAT_STAT.PLAYER_ID%TYPE) RETURN NUMBER IS V_AVG NUMBER; BEGIN SELECT HITS / AT_BATS INTO V_AVG FROM PLAYER_BAT_STAT WHERE PLAYER_ID = V_ID; RETURN (V_AVG); END; Which statement will successfully invoke this function in SQL *Plus?

A) START CALC_PLAYER_AVG(31)
B) SELECT CALC_PLAYER_AVG(PLAYER_ID) FROM PLAYER_BAT_STAT;
C) CALC_PLAYER_AVG(31);
D) EXECUTE CALC_PLAYER_AVG(31);
E) CALC_PLAYER('RUTH');

Solutions: