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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
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Cascade Delete JunctionT Comment from Ramona W @ 6/30/2014
No I didn't.  You didn't do it in the seminar so I thought the junction tables kind of did it for you.

The reason I thought this is because when I went to add ref integrity, there was something already in there that I never put there, and have no idea where it came from.

ie) 3 tables - MSysNavPane
  a-Group Categories
  b-Group
  c-Group to objects

Anyway, apparently I should have added referential integrity.  So would it be:
  OrgT, MemberT, OrgXMemberT

OrgT (left join option 2) to OrgXMemberT - Referential Integrity - Cascade Delete?

AND

MemberT (left join option 2) to OrgXMemberT - Referential Integrity - Cascade Delete?

I wouldn't have to worry about address and contact tables would I?



Reply from Richard Rost:

You would need referential integrity with cascade deletes set up if you want to delete the junction table record when a member record (or an org record) is deleted.

Show Just This Thread        Post Reply
Cascade Delete JunctionT Comment from Ramona W @ 6/29/2014
Hi Rick!  I have another question and unfortunately not as educated as Chris, so I am scared to mess with my DB too much.

With regards to Lesson 14 & 15 of seminar - Org & Members.  I deleted a member from the memberF, which also did the deletion to the memberT.  However on the OrgXMemberSubF (now shows a blank space), the MemberXOrgSubF (still shows the org), and the OrgXMemberT (Still contains all of the data).

I have already tried several things, none to which have worked. I went to add DB relationships for the OrgT, MemberT, and the OrgXMemberT - but apparently have not picked the right choices and I am now really confused.

I also built a DB for my books - AuthorT, BookT, SeriesT, and BookXAuthorT - Unfortunately the same thing happened.  (Of course an AUTHOR can have more than 1 book & create more than 1 series - A BOOK can have more than 1 author & it can belong to more than 1 series - A SERIES can have more than 1 author & has more than 1 book - Which is why I used a JunctionT)

ie) Series A, has Book 1, 2, 3
ie) Series B, has book 4, 5, 6 which are also the same books as in Series A, Book 1, 2, 3.

Can you please help?  Thank you in advance!

P.S.  I really loved this seminar especially lesson 14 & 15.  I love that you can have multiple relationships and these sub forms that shows you the information pertaining to only that person.  I ABSOLUTELY LOVE IT!

IE) Have PersonF (with specific data like DOB) and then sub forms that show the organizations, Other groups, Address, Phone numbers, Supervisors, Contact Notes etc.  Then Have OrgF (with specific website and email) and then sub forms showing the people, Address, Phone numbers, and contact notes!!!



Reply from Richard Rost:

Did you have referential integrity set up?
Show Just This Thread        Post Reply

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