Actually, this was all I had to use to get all the constraints in my database:
SELECT *
FROM INFORMATION_SCHEMA.TABLE_C
The constraint its complaining about doesn't exist.
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Question
Creating a Foreign Key Constraint
Experts,
I have a table called "Agent" with a primary key of AgentID. I want to create a foreign key in my "AgentClient" table using a script. This is how I'm attempting to do it:
ALTER TABLE AgentClient
ADD CONSTRAINT fk_AgentID FOREIGN KEY(AgentID)REFERENCES Agent(AgentID)
GO
However I get this error:
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "fk_AgentID". The conflict occurred in database "CCS_Central", table "dbo.Agent", column 'AgentID'.
There is not constraint by that name on either table. What could be the issue?
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Answers
You are right "it shouldn't be a problem that there are values in it that are not in AgentClient"
However, as per my knowledge, foreign keys not existing in the primary key table is the reason for this error. Did you also check for NULL/blank values.
This query can help you confirm:
select A.*
from foreigntable A
left outer join primarytable B on A.foreignkey = B.primarykey
where B.primarykey is null
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by: jparulPosted on 2009-10-19 at 10:50:01ID: 25607353
Is it possible that fk_AgentID has been created as a constraint for some other table.
Depending on what version of SQL server you are using, you can use the following query to list all constraints in your DB:
select
o1.name as Referencing_Object_name
, c1.name as referencing_column_Name
, o2.name as Referenced_Object_name
, c2.name as Referenced_Column_Name
, s.name as Constraint_name
from sysforeignkeys fk
inner join sysobjects o1 on fk.fkeyid = o1.id
inner join sysobjects o2 on fk.rkeyid = o2.id
inner join syscolumns c1 on c1.id = o1.id and c1.colid = fk.fkey
inner join syscolumns c2 on c2.id = o2.id and c2.colid = fk.rkey
inner join sysobjects s on fk.constid = s.id