Solved

many-many relationship

Posted on 2011-09-06
3
220 Views
Last Modified: 2012-05-12
I was trying to understand about many-many relationship. Say many customers have many phone numbers. How does it impact single customer. Like Single customer always have many phones(like home phone, mobile phone, office phone number etc ). Then that becomes one-many relationship right not many-many. Thanks in advance
0
Comment
Question by:gudii9
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 47

Accepted Solution

by:
for_yan earned 250 total points
ID: 36492745

check example this example:

say one stock can belong to many categories - say commodities, big company

and one category cabn conating many duifferent stocks

look at details here:


http://www.mkyong.com/hibernate/hibernate-many-to-many-relationship-example/
0
 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 250 total points
ID: 36493871
>>
Like Single customer always have many phones(like home phone, mobile phone, office phone number etc ). Then that becomes one-many relationship right not many-many.
>>

When you think about N-N relationships, it's helpful to think of database use cases.
In a situation like you mention above (customer, phones and many-many), the following use cases spring to mind:

1. Given a customer, find their phone number(s)
2. Given a phone number, find to which customer(s) it belongs

The second one is made possible by many to many. Phone number X could belong to customers Y or Z, because Y and Z live at the same address
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 36585704
?
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:

740 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question