SQL Development
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
 
 
User Name:
Password:
Remember me
Go Back   ASP Free Forums > Database > SQL Development
Reload this Page

Many-to-Many Query

Discuss Many-to-Many Query in the SQL Development forum on ASP Free.
Many-to-Many Query SQL forums discussing structured query language related questions that are platform independent. Discussions include advanced topics such as joins, stored procedures, and triggers.

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
« Previous Thread | Next Thread »  
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread ASP Free Forums Sponsor:
  #1  
Old August 21st, 2004, 06:06 PM
lesue11 lesue11 is offline
Registered User
ASP Free Newbie (0 - 499 posts)
  
Join Date: Aug 2004
Posts: 4 lesue11 User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
Many-to-Many Query
Here is the setup I have:

"picture" table
picID
...

"picsubject" table
picID
subjectID

"subject" table
subjectID
...

In this many-to-many relationship sometimes it is not necessary to list a subject with a particular picture. So I want to be able to find out how many of the pictures do not have a subject listed in the picsubject table. Is this possible with SQL? I would love to hear any suggestions.
Thanks
Reply With Quote
  #2  
Old August 21st, 2004, 07:05 PM
Memnoch's Avatar
Memnoch Memnoch is offline
Unholy Moderator
Click here for more information.
  
Join Date: Oct 2003
Location: In hell, where did you think?
Posts: 11,781 Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level) 
Time spent in forums: 3 Weeks 5 Days 8 h 45 m 55 sec
Reputation Power: 470
Code:
SELECT A.PicID
FROM picture As A
INNER JOIN picSubject As B On (A.PicID = B.PicID)
WHERE (B.Subject = '' OR B.Subject Is Null)
Reply With Quote
  #3  
Old August 21st, 2004, 07:20 PM
lesue11 lesue11 is offline
Registered User
ASP Free Newbie (0 - 499 posts)
  
Join Date: Aug 2004
Posts: 4 lesue11 User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
Quote:
Originally Posted by Memnoch
Code:
SELECT A.PicID
FROM picture As A
INNER JOIN picSubject As B On (A.PicID = B.PicID)
WHERE (B.Subject = '' OR B.Subject Is Null)

Let me explain further...

In the picture table I might have this:
picID filename
001 test.jpeg

in the subject table I might have this:
subjectID subject
001 Barry Bonds

So to match the information I would place into the picsubject table:
picID subjectID
001 001

All the pictures may or may not have an entry in the picsubject table. It all depends on whether or not you want to specify the subject of the picture. So say I have another entry in the picture table with picID 002 and it is not entered into the picsubject table. How can I perform a query to find out that picture or any other picture is not tied to a subjectID in the picsubject table. Hopefully this makes sense.
Reply With Quote
  #4  
Old August 21st, 2004, 09:53 PM
Memnoch's Avatar
Memnoch Memnoch is offline
Unholy Moderator
Click here for more information.
  
Join Date: Oct 2003
Location: In hell, where did you think?
Posts: 11,781 Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)Memnoch User rank is Lieutenant Colonel (40000 - 50000 Reputation Level) 
Time spent in forums: 3 Weeks 5 Days 8 h 45 m 55 sec
Reputation Power: 470
Code:
SELECT *
FROM picture
WHERE PicID NOT IN
(
   SELECT DISTINCT PicID
   FROM PicSubject
)
Reply With Quote
Reply

Viewing: ASP Free Forums > Database > SQL Development > Many-to-Many Query

« Previous Thread | Next Thread »

Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
Linear Mode Linear Mode
Rate This Thread:


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox
Forum Jump


Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
  
 





© 2003-2008 by Developer Shed. All rights reserved. DS Cluster 3 hosted by Hostway. 
Stay green...Green IT