RE: How do they get the answer?

What if there are no subject_ids of either 102 or 105 or both in the table? I'd say it's a case of not enough info (for us that is, not enough thought on the part of whoever made it up but then they didn't ask the list did they ;-) ).  

This is why I dislike word problems.....  

Linda  

 -----Original Message-----
Sent: Tuesday, August 21, 2001 12:52 PM
To: Multiple recipients of list ORACLE-L

i still stand by(reading into the question) that it could be only 2 teachers get a raise, if the same 2 teachers teach both of those courses. would they get twice as much of a raise? :)  

joe

>>> jonw_at_fuse.net 08/21/01 12:52PM >>>
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)
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
<http://www.orafaq.com>
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> Author:
> INET: kjanusz_at_att.net
>
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-- 
Author: Jon Walthour
  INET: jonw_at_fuse.net

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-- 
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-- 
Author: Seley, Linda
  INET: LSeley_at_IQNavigator.com

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