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6/20/2012 1:34:26 AM
Access Relationship Seminar
By Richard Rost   Richard Rost on Facebook Richard Rost on Twitter Richard Rost on Google Plus Richard Rost on LinkedIn Email Richard Rost

In this seminar, you will learn just about everything there is to know about relationships in Microsoft Access. Setting up proper relationships between your tables is absolutely crucial to building a successful database. Bad table design, and bad relationships between those tables, is disasterous, and will cause you nothing but trouble down the line.

This seminar covers just about all of the different possible relationship scenarios that you will ever come across. We will build eight (8) different database projects so you can see how to set up good relationships between your tables. This seminar will teach you about all of the following types of relationships:

1. No relationships
2. One-to-Many
3. One-to-One
4. Many-to-Many
5. Self-Join One-to-Many
6. Self-Join Many-to-Many
7. Reverse Relationships
8. Multiple Relationships

We will build sample databases to track:

1. Children to Parents with their relation (one-to-many)
2. Which parents receive mail on their child's behalf
3. Student data with a secondary optional detail table (one-to-one)
4. Vendors to Products and vice versa (many-to-many)
5. Employees to Supervisors (self-join, one-to-many)
6. Complete family history with relationships (self-join, many-to-many)
7. Organizations to Members (whether companies, families, charities, etc.)

You can learn more about this seminar here: Access Relationship Seminar

Of course if you have any questions, post them here!

Permanent Link
Course Link: Access Relationship Seminar
Keywords: access relationships
Page Tag: whatsnew
Post Reply

DLookUp Comment from Richard W @ 6/19/2016
The information is already in a subform.  Rick said it is possible to put a subform in a subform but is a problem.  Further I was trying to learn DLookup since he talks about its power.  But if I have to use a query and a sub-subform, I guess I need to know where I can learn to do that!  Thanks for the answer.  I am trying to use the DLookup approach since I have, in fact, three groups of people with many to many relationships and I am  trying to standardize the way the information on all of them is stored . . . following Rick's advice that "if you have a second telephone number (or email or whatever) you should put it in a separate table" (paraphrased, not quoted).

Reply from Alex Hedley:

Show Just This Thread        Post Reply
DLookUp Comment from Richard Wilson @ 6/16/2016
At 5:11 you talk about using a DLookUp for a specific type of address or phone number.  I need to know how to do that.  I built my original forms based upon tables with (for example) OfficePhone, CellPhone etc as separate fields.  I have now gone back and put all the phone numbers in one table with a TypeT containing a TypeID and such things as Office, Cell, Fax, Home etc.  Same sort of thing for email, address, Title (this is a DB for teachers in a school where one may be on two or more faculties and be Professor in one and Artist in Residence on another).  Anyway, my DLookup for such things as phone numbers no longer works.  I need to specify which is Office and which is Cell, etc.  I have tried to use a Where condition using an "AND" clause where an ID = Combo ID AND TypeID = 1 (I know I have not done the right syntax here) but I get a "mismatch" error in the second part of the AND clause.  I do not understand that since TypeID is a number and "1" certainly is an number.  I do NOT put "" around 1 but Access does.  Long question, I know, but it is one I am wrestling with right now.  Further, since this deals with teachers in schools, I also need to narrow the result to a specific school where the student is enrolled.  That may be beyond the scope of this class, but it is my problem.  Especially since I have gone back and redone my tables to make phone numbers (for the teachers, at least: thinking about doing it for the Students/contestants as well as the people in the town where the competition is held!!; same for addresses, emails, etc).  Anyway, I need to do what you said at 5:11.  Excellent Seminar.  I have listened to it many times.  It takes repeated hearing for me to learn it.  But after two years, I am beginning to grasp some of it!!

Reply from Alex Hedley:

Why not just create a Query that uses the CustomerID to filter on (with the others) and have it as SubForm.
Show Just This Thread        Post Reply

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