Re: How do they get the answer?

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: kjanusz_at_att.net
> Date: 2001/08/21 Tue PM 12:25:54 EDT
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> 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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> Author:
> INET: kjanusz_at_att.net
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jon Walthour
  INET: jonw_at_fuse.net

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