two subjects in the "in" clause, times at least two teachers per subject
equals at least four records updated.
sometimes it is easier to eliminate answers first.
like, you can throw out d) syntax will occur. and b) all teachers will get
an increase.
you are then left with a) two teachers and c). at least four teachers.
Since the "where" clause is looking at the 'subject_id' column, rather than
the 'teacher_id' column, you can almost guess that it is c).
hope this helps.
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Tuesday, August 21, 2001 12:26 PM
To: Multiple recipients of list ORACLE-L
I am taking the Self-Test software test for the SQL exam
and don't see how they get the answer to this problem.
They don't explain how it is arrived at.
Any help you can give me will be appreciated.
Thanks,
Ken Janusz, CPIM
----------------------------------
Examine the structure of the TEACHER table:
Name Null? Type
ID NOT NULL NUMBER(9)
SALARY NUMBER
(7,2)
SUBJECT_ID NOT NULL NUMBER(3)
SUBJECT_DESCRIPTION VARCHAR2(2)
There are 200 teachers and 15 subjects. Each subject is
taught
by at least 2 teachers.
Evaluate this PL/SQL block:
DECLARE
v_pct_raise number := 1.10;
BEGIN
UPDATE teacher
SET salary = salary * 1.10
WHERE subject_id IN (102, 105);
COMMIT;
END;
Which result will the PL/SQL block provide?
(A) Only two teachers will receive a 10% salary increase.
(B) All of the teachers will receive a 10% salary
increase.
(C) At least four teachers will receive a 10% salary
increase.
(D) A syntax error will occur.
Answer:
(C)
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