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How do they get the answer?

From: <kjanusz_at_att.net>
Date: Tue, 21 Aug 2001 09:11:00 -0700
Message-ID: <F001.00372691.20010821082554@fatcity.com>

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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Received on Tue Aug 21 2001 - 11:11:00 CDT

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