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Got error creating a FK

Posted on 2011-03-10
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Last Modified: 2012-05-11
Hi, I'm using sql 2005, sp3.  Please see the attached file for the error screen.  How to fix this?  thanks.
FkError.jpg
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Question by:lapucca
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7 Comments
 
LVL 24

Expert Comment

by:jimyX
ID: 35098762
Are there any missing values in the Primary Key table?
0
 

Author Comment

by:lapucca
ID: 35099902
What do you mean by missing values?  what am I looking for that's missing?  thank you.
0
 

Author Comment

by:lapucca
ID: 35099947
If I remove "Check existing data upon creation" then the FL relationship is saved just fine.  I still like to correct this problem.  What should I check and correct ?  Thanks.
0
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LVL 40

Expert Comment

by:lcohan
ID: 35099960
You should check all values and make sure no duplicates exists then you should be able to add it with check. Check related tables by that column as well for FKeys perspective.
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Author Comment

by:lapucca
ID: 35099985
Do you mean no duplicate rows?  I mean, it's 1 to many so personID is repeated in the history table.  
Can you elaborate on this "Check related tables by that column as well for FKeys perspective." ?  Thanks.
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LVL 40

Accepted Solution

by:
lcohan earned 2000 total points
ID: 35100151
Yeah my bad for that...that would be for the PK not FK as you can't add a PK on a table with duplicates..
And of course in a one to many relation you should check following for orphans:
You cant add a 1-many relation if the parent is missing so I would run smthing like:

select id from child_table
except
select id from parent_table

thias will give you the list of all children without parents and you need to
a: delete if possible as orphans
b: find the parent and restore the entry in parent_table.

hope this helps...
0
 

Author Closing Comment

by:lapucca
ID: 35100872
Great, thanks.  Orphan records is the culprit here.
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