?
Solved

oracle table question for one to many relations

Posted on 2013-01-23
6
Medium Priority
?
434 Views
Last Modified: 2013-01-24
I have a created table

1. hospital
2. hosp_contacts
3. contacts

Hospital to hosp_contacts - one to many
Now I want to create another table contacts
Contacts will have one to many relationships to hosp_contacts.
Based on the erd that I attached, will my new table contacts have
contacts_id,
contact_id ( from hosp_contacts),
hospital_id ( from hospital).
Please let me know.
Hospital-erd.bmp
0
Comment
Question by:anumoses
[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
  • 3
  • 2
6 Comments
 
LVL 77

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 500 total points
ID: 38810070
What additional attributes will the new contact table have that the hosp_contact table does not?

I also don't like contact means stored in the same table as the name type information.  What if a persone has more than one email address?  Many people these days have more than one cell phone.  As soon as you start adding these up, the table becomes pretty ugly (2 or 3 email address columns, 2 or 3 phone columns, etc...).

You might think about splitting this out into a person_contact type table.
0
 
LVL 35

Expert Comment

by:johnsone
ID: 38810088
The table that you are creating that links HOSPITAL and HOSP_CONTACTS should only need 2 fields.

HOSPITAL_ID, which links back to HOSPITAL
CONTACT_ID, which links back to HOSP_CONTACTS

Creating an additional id in that table is not useful.  It will never be used anywhere.
0
 
LVL 6

Author Comment

by:anumoses
ID: 38810353
The reason we have to do this is

hosp_contact table we will only store the contact id hospital id and the key is hosp_contact_id
The contact table will have one to many relation ship to hosp_contact table. And hospital will have one to many with hosp_contact
Hospital-erd.bmp
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 35

Accepted Solution

by:
johnsone earned 500 total points
ID: 38810414
But, what is the point of HOSP_CONTACT_ID in HOSP_CONTACTS?  You are creating a key field just for the sake of creating a key field.  It is not referenced in any other table and you will never be querying on that field.
0
 
LVL 6

Author Comment

by:anumoses
ID: 38810445
Thats true. I dont have to have. I thought of primary but as you said  only contact id and hospital_id are enough.
0
 
LVL 6

Author Closing Comment

by:anumoses
ID: 38814556
thanks
0

Featured Post

Industry Leaders: 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

Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
Shell script to create broker configuration file using current broker Configuration, solely for purpose of backup on Linux. Script may need to be modified depending on OS-installation. Please deploy and verify the script in a test environment.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
This video shows setup options and the basic steps and syntax for duplicating (cloning) a database from one instance to another. Examples are given for duplicating to the same machine and to different machines
Suggested Courses

800 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