I think I forgot something usefull...!!!! ----- Original Message ----- From: "Beau Lebens" <[EMAIL PROTECTED]> To: "PHP DB (E-mail)" <[EMAIL PROTECTED]> Sent: Thursday, February 21, 2002 3:59 AM Subject: [PHP-DB] SELECT where something exists but something else does not
> Hey guys, > I am a little stuck here, i know how to botch a solution together using a > bunch of queries and PHP manipulation, but i am sure there is a more elegant > way to do this one; > > i have some tables (i won't put their full defs, just bits that are relevant > (they are huge)) > > TABLE students > FIELDS > studentID > fname > lname > title > studentNo > > TABLE theses > FIELDS > thesisID > studentID > title > > TABLE thesis_reports > FIELDS > reportID > thesisID > year > > > now, what we are dealing with here is records of theses and the reports that > students are required to submit relating to them (yearly). i need to be able > to pull up a record of students who have a record of a thesis (something in > table "theses") but do NOT have an entry in "thesis_reports" for this year > yet. > > an attempt at some SQL that sort of pretends to do the right thing :) > > SELECT DISTINCT(students.studentID), students.title, students.fname, > students.lname, students.studentNo FROM students, theses, thesis_reports > WHERE theses.studentID=students.studentID AND > thesis_reports.thesisID=theses.thesisID AND thesis_reports.year != '2002' > > does that make sense? > what it actually returns is just any student with any record in the DB under > thesis_reports that doesn't eqal '2002', even if they happen to also have > one that *is* for 2002 (ie. my test student has a report for 1999, 2001 and > 2002, but still gets selected by that > > > -- > Beau Lebens, Technical Officer > Science and Mathematics Education Centre > Curtin University of Technology, > GPO Box U1987 Perth, Western Australia 6845 > CRICOS provider code 00301J > > t: +61 8 9266-7297 (has voice-mail) > f: +61 8 9266-2503 (ATT: Beau Lebens) > e: [EMAIL PROTECTED] > w: http://learnt.smec.curtin.edu.au/ > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >
thesis_test.zip
Description: application/compressed
-- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
