Re: Stuck on Foreign Keys

On Wednesday 19 September 2007, Chester wrote:
> Hi
>
> I have a question regarding foreign keys, I just cannot get it to create
> them for me....I must be doing something wrong but I have no idea what
> that might be :)
>
> I have a table "clients"
>
> clientID (primary)
> ticode
> Firstname
> SecondName
>
> I have a second table "titles"
>
> ticode (primary)
> Title
>
> I am trying to create a foreign key on TIcode "clients" table as in below,
>
> ALTER TABLE clients ADD CONSTRAINT the_title FOREIGN KEY (ticode)
> REFERENCES titles (ticode) ;
>
> I keep getting this error
>
> ERROR: insert or update on table "clients" violates foreign key
> constraint "the_title"
> DETAIL: Key (ticode)=( ) is not present in table "titles".

This foreign key constraint that every instance of clients.ticode must have a
corresponding (unique) titles.ticode. But you don't - there are records in
clients where there's a ticode value that's not found in titles.ticode.

Cheers!

-Ben

--
I kept looking for somebody to solve the problem.
Then I realized - I am somebody.
-- Author Unknown

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