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Access 2007 - relationship

Posted on 2011-02-17
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Last Modified: 2012-05-11
I am at a loss in setting up the following design.
My OS is windows 7.
I have a main table called tblContacts, and one of the fields is called 'Responsible for'.

There is another table called tblResponsible4' which has only 2 fields, 1 is an ID and the other called Resp4.

One contact can be responsible for more than 1 item.  But  there is only 1 field on the main table called 'Responsible for' to capture the data which is entered via Form using a combo box.   Would I need to duplicate the record and then enter the new data for the 'Resp 4'
eg : Mr. A is responsible for 'Food' and 'Drinks'
or even more than 2 or just only 1 item.
Hope someone can send me a simple design of  how this is achieved. thank u.
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Question by:jegajothy
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LVL 120

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Rey Obrero (Capricorn1) earned 167 total points
ID: 34919657
you need to create a junction table

tblContacts          contactResp            tblResponsible4
ID            1 ------M   ContactID
                                RespID      M ------ ID



see this demo

http://office.microsoft.com/en-us/access-help/demo-set-the-relationship-between-two-tables-HA010254901.aspx?pid=CH100739911033
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Expert Comment

by:senatort77
ID: 34920270
make relaen tion between the 2 tables in sort to give the person id to the items
ex: the ID 4 mr a to food and drinks
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Author Comment

by:jegajothy
ID: 34921344
Can someone please take a look and fix the attached table.  It has only one record in the Committee table and in the main table 105.  I just cannot understand the logic or how to do it. thank u. email-database.accdb
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Assisted Solution

by:Jeffrey Coachman
Jeffrey Coachman earned 333 total points
ID: 34962090
1. <I have a main table called tblContacts, and one of the fields is called 'Responsible for'.>
Not in the DB you posted...

2. Even so, the SeniorsClub table is missing a primary key...
Hence you cannot set up a true 1-->M

3. It is difficult to tell form the DB you posted, if the relationship needs to One to Many or many to many.
<One contact can be responsible for more than 1 item.>
...note that your sample does not contain an Items table either...
causing further confusion...

<I just cannot understand the logic or how to do it.>
Then please study up on relationships *before* building and relating your tables.
http://support.microsoft.com/kb/304466
http://www.databaseprimer.com/relationship.html

A typical One to many is like this:
tblCustomers
CustID(PK)
CustName
CuatCountry
...ect

tblOrders
OrderID(PK)
CustID(Fk)
OrderDate
Shipper
...etc

In other words, One customer can have many Orders.


A typical Many to Many would be like this:
tblClasses
ClassID(PK)
ClassName
ClassLocation

tbStudents
StudnetID(PK)
StudentName
StudentPhone
...etc

tblStudentClasses
StudentClassID(PK)
StudnetID(FK)
ClassID(FK)

In this case one Class can have many Students *AND* one Student can have many Classes.


So again, it is not clear what your actual structure *should* be.

So study what we have all posted here, and post back with your revised Question.

;-)

JeffCoachman
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LVL 74

Assisted Solution

by:Jeffrey Coachman
Jeffrey Coachman earned 333 total points
ID: 34962208
...in a nutshell, the tables in the DB you posted (especially the SeniorsClub table) do not appear to be properly "Normalized".
So you may want to research this first:
http://databases.about.com/od/specificproducts/a/normalization.htm
http://www.phlonx.com/resources/nf3/
...et al

You also have issues with not having a Standardized naming convention for your tables or fields.:
http://en.wikipedia.org/wiki/Leszynski_naming_convention
http://www.acc-technology.com/namconv.htm

http://www.xoc.net/standards/rvbanc.asp
...et al

JeffCoachman

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