Re: BUG #2771: NULL values in FOREIGN KEY fields - Mailing list pgsql-bugs

On 11/20/06, vincent <vincent@iim.nctu.edu.tw> wrote:
> When insert a null value in foreign key fields, an error occurs.
>
> CREATE TABLE TGroup (
>   C_Group_ID CHAR(8) NOT NULL,
>   C_Group_Name VARCHAR(50),
>   C_Group_Parent CHAR(8) NOT NULL,
>   CONSTRAINT TGroup_C_Group_Parent_fkey FOREIGN KEY (C_Group_Parent)

That's because your C_Group_Parent column has a Not Null constraint
and you can't insert null values in a Not Null columns

--
regards,
Jaime Casanova

"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs and the universe trying
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So far, the universe is winning."
                                       Richard Cook