[mso] Re: Relationships
- From: "Colli, Anthony G" <Anthony.Colli@xxxxxxx>
- To: <mso@xxxxxxxxxxxxx>
- Date: Tue, 22 Apr 2003 10:57:12 -0400
Karen-
If I am not mistaken, when using Access 2000 in the situation you describe,
there is only a single set of relationships. If for example in the database
backend of your set up you had a relationship between a 'customer' table and a
'orders' table on a column of 'custID', this relationship would appear in the
front end application too. I a pretty sure this only work with access tables,
if you were linked to Dbase or something else the relationships would not
populate to the front end.
In a situation where there may be multiple front ends working from the same
.mdb backend it would make sense to create all the relationships on the
backend. A single source of change.
You can always add or delete relationships when querying the database. These
relationships are not saved anywhere in the actual database schema. This is
handy for querying data from sources that have been imported from Excel or some
other flat file system.
Relationships are used to create integrity in the database. You generally do
not want a 'order' from a 'customer' who does not have a 'custID'. This would
follow a business rule of "all orders must be from a customer". This is
enforced in the database by a one to many relationship on 'orders' and
'customers' on the column 'custID'. If the customer is in the 'customer' table
then they have a 'custID', if not they must be added to the table first.
-Anthony
-----Original Message-----
From: Karen Willingham [ mailto:kwillingham@xxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Monday, April 21, 2003 9:07 AM
To: 'mso@xxxxxxxxxxxxx'
Subject: [mso] Relationships
I have 2 mdb files. 1 has all the tables. The other has all the reports and
query and forms, I linked the tables to this file. I want to better
understand Relationships. I have the relationships set up on the mdb file
with the tables. Is that the best way? Should I have any relationships set
up on the reports mdb file too? If I do not do it just like the other file
would it mess things up?
Karen Willingham
Magnolia Marketing of Lafayette
Sales/Graphics Dept.
(337) 593-7854
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