in the where clause, the IN says "any teachers that are in any of these subjects.
Since there are two subjects in the IN set and at least 2 teachers have to teach each
subject, 2*2=4. Basic mathematics: at least 4 teachers will get a raise.
Jon Walthour
>
> From: [EMAIL PROTECTED]
> Date: 2001/08/21 Tue PM 12:25:54 EDT
> To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> Subject: How do they get the answer?
>
> 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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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: [EMAIL PROTECTED]
>
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--
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--
Author: Jon Walthour
INET: [EMAIL PROTECTED]
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