Database Diagrams: FOREIGN KEY Constraint Fell Off; Can't Drop/recreate It...

Mar 25, 2006

Hello,

I have two tables Person & Location where Location has a primary key LocationId and Person has a foreign key LocationId.

Sometime ago I used the Database Diagrams visual tool of SQL Server Management Studio Express to create the foreign key relationship between the two tables - i.e. "visually" (drawing a line between the PK & FK LocationId elements of both tables).

Time has passed and I recently noticed that, upon retrieving my saved diagram, the foreign key relationship had "fallen off" (i.e. the many-to-one line was no longer showing in the diagram).

After recreating the relationship (redrawing the line) I find that I get an error message when I try to save the diagram:

Post-Save Notifications
[!] Errors were encountered during the save process. Some database objects were not saved.

'Location' table saved successfully
'Person' table
- Unable to create relationship 'FK_Person_Location'. 
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Person_Location". The conflict occurred in database "mydb", table "dbo.Location", column 'LocationId'.

When I go back to the object explorer and view the dependencies for the two tables, there is no dependency (between these two tables) revealed.  When I try to create the foreign key constraint manually (T-SQL) it again says can't add the constraint.  It comes up with an error as follows:

ALTER TABLE Person
ADD FOREIGN KEY (LocationId) REFERENCES Location (LocationId)

Msg 547, Level 16, State 0, Line 2
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK__Person__LocationId__793DFFAF". The conflict occurred in database "mydb", table "dbo.Location", column 'LocationId'.

(Note:  Each time I do this, the 8 hexadecimal character suffix changes.)

When I try to drop the foreign key:

alter table Person
drop constraint FK__Person__LocationId

it comes back with the error:

Msg 3728, Level 16, State 1, Line 2
'FK__Person__LocationId' is not a constraint.
Msg 3727, Level 16, State 0, Line 2
Could not drop constraint. See previous errors.

So it seems that there's some kind of goof up here.  Can anybody shed light on this / tell me how to fix it?

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