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hierarchical relation in access

Posted on 2013-10-28
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Last Modified: 2013-10-29
Hey Everyone!

I am trying to create a hierarchical relation in access.
I creating a desktop database application for an Automobile Repair Shop. In that I have created an entity ServiceID which is the parent Entity. Further this entity will have children such as Repair, Maintenance and BuySell.

I have attached a snapshot of the ERD.

How should I implement this in my application?

Any suggestions?

Thank you!
DB1.jpg
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Question by:varshneyprateek
2 Comments
 
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Accepted Solution

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Scott McDaniel (Microsoft Access MVP - EE MVE ) earned 500 total points
ID: 39608244
First: Your Repair, Maintenance and BuySell tables should NOT use the ServiceID as their Primary Key. That should be the Foreign Key field, and you should create another field for those tables' Primary Key.

If a single Services record can contain more than one of those downstream entities (or can contain multiples of a single downstream entity) then you'll need to create a Many-to-Many "bridge" table. This would be a table that stores (a) the Services.ServiceID value and (b) the PK value from the second table. So if you add a new field to the Repair table named RepairID, you'd store the value of that field in the bridge table along with the ServiceID of the parent record.
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Expert Comment

by:Helen_Feddema
ID: 39609157
See my sample database illustrating many-to-many relationships:

http://www.helenfeddema.com/Files/accarch178.zip

and here is an image of one of its forms:

Many-to-many relationships form
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