Change one-to-one relationship to one-to-many relationship

Hi ,

I made a relationship between two tables in my database in the Relationships window. The relationship should be one-to-many, but Access keeps assigning it as one-to-one. The structure of the tables is as follows:

mother table
- primary key = surveyid

child table
- primary key and foreign key = surveyid
- primary key = row number

Right now when I enter data into the child table, I am only allowed to enter one row and it gives me a primary key violation when I try to enter a second row. How can I resolve this? Should I try to change the relationship type, and if so how do I do that?

Thanks.
ghaphisAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
 
DatabaseMX (Joe Anderson - Microsoft Access MVP)Connect With a Mentor Database ArchitectCommented:
ghaphis

If your foreign key (surveyid) has the Indexed property set to Yes AND No Duplicates, then this situation will arise. And as note, you cannot have two Primary Keys.   And further, do not even Index the foreign key, because IF ... you have a correct relationship with Referential Integrity set to Yes, JET will automatically create a (hidden) Index on the foreign table.

mx
0
 
JamesCronshaw1Commented:
Change your child table to drop the SurveyID from the Primary key, as it appears this is not required (though I could be wrong here dependant on your logic).  

In your Relationships window, select the relationship thats causing you the issue and double-click it to open the change dialog.  You can then make changes you wish to it (remembering to save of course!)
0
 
borkiCommented:
I am not sure what is wrong here. All your design sounds fine. to proof the concept I have knocked up a simple .mdb that illustrates this.

I suspect that something went astray when you created the key for the second table or the relationship.

MotherChild.zip
0
Get 10% Off Your First Squarespace Website

Ready to showcase your work, publish content or promote your business online? With Squarespace’s award-winning templates and 24/7 customer service, getting started is simple. Head to Squarespace.com and use offer code ‘EXPERTS’ to get 10% off your first purchase.

 
JVWCCommented:
Create this:
mother table
- primary key = surveyid

child table
- primary key = autonumber
- foreign key = surveyid

Cheers
JC
0
 
JVWCCommented:
Further...

mother table
- primary key = surveyid <<<OK

child table
- primary key and foreign key = surveyid <<< This will create a 1 to 1 relationship
- primary key = row number <<< Cannot have TWO primary keys in same table.

Cheers
JC
0
 
DatabaseMX (Joe Anderson - Microsoft Access MVP)Database ArchitectCommented:
"automatically create a (hidden) Index on the foreign table."

>> s/b automatically create a (hidden) Index on the foreign KEY.

mx
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.