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Home -> Community -> Mailing Lists -> Oracle-L -> RE: How do they get the answer?
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;
(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 -- Author: INET: kjanusz_at_att.net Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-LReceived on Tue Aug 21 2001 - 11:44:59 CDT
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