From jonw@fuse.net Tue, 21 Aug 2001 10:21:09 -0700 From: Jon Walthour Date: Tue, 21 Aug 2001 10:21:09 -0700 Subject: Re: How do they get the answer? Message-ID: MIME-Version: 1.0 Content-Type: text/plain 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@att.net > Date: 2001/08/21 Tue PM 12:25:54 EDT > To: Multiple recipients of list ORACLE-L > 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 > -- > Author: > INET: kjanusz@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@fatcity.com (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jon Walthour INET: jonw@fuse.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@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).