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Oracle9i program with pl/sql Sample Questions:

1. The add_player, upd_player_stat, and upd_pitcher_stat procedures are grouped together in a package. A variable must be shared among only these procedures.
Where should you declare this variable?

A) In the package body.
B) In each procedure's DECLARE section, using the exact same name in each.
C) In the package specification.
D) In a database trigger.

2. 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) EXECUTE CALC_PLAYER_AVG(31);
C) SELECT CALC_PLAYER_AVG(PLAYER_ID) FROM PLAYER_BAT_STAT;
D) CALC_PLAYER_AVG(31);
E) CALC_PLAYER('RUTH');

3. Examine this code:
CREATE OR REPLACE FUNCTION gen_email_name
(p_first_name VARCHAR2, p_last_name VARCHAR2, p_id NUMBER)
RETURN VARCHAR2
is
v_email_name VARCHAR2(19);
BEGIN
v_email_home := SUBSTR(p_first_name, 1, 1) ||
SUBSTR(p_last_name, 1, 7) ||
'@Oracle.com';
UPDATE employees
SET email = v_email_name
WHERE employee_id = p_id;
RETURN v_email_name;
END;
You run this SELECT statement:
SELECT first_name, last_name
gen_email_name(first_name, last_name, 108) EMAIL
FROM employees;
What occurs?

A) The SQL statement executes successfully and control is passed to the calling environment.
B) The statement fails because functions called from SQL expressions cannot perform DML.
C) The statement fails because the functions does not contain code to end the transaction.
D) Employee 108 has his email name updated based on the return result of the function.
E) The SQL statement executes successfully, because UPDATE and DELETE statements are ignoring in stored functions called from SQL expressions.

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

5. Examine the trigger heading:
CREATE OR REPLACE TRIGGER salary_check BEFORE UPDATE OF sal, job ON emp FOR EACH ROW
Under which condition does this trigger fire?

A) When a row is inserted into the EMP table.
B) Only when both values of the SAL and JOB columns in a row are updated together in the EMP table.
C) When any column other than the SAL and JOB columns in a row are updated in the EMP table.
D) When the value of the SAL or JOB column in a row is updated in the EMP table.

Solutions: