Re: ERROR: UNIQUE constraint ... not found?

On Wednesday April 2 2003 3:31, Ed L. wrote:
> Well, I've stared at this little riddle for long enough. Anyone see a
> mistake?
>
> CREATE TABLE person (
> id SERIAL,
> name VARCHAR NOT NULL
> );
>
> CREATE TABLE session (
> id SERIAL,
> person_id INTEGER NOT NULL,
> FOREIGN KEY (person_id) REFERENCES person (id)
> );
>
> psql:test.sql:12: ERROR: UNIQUE constraint matching given keys for
> referenced table "person" not found

Ah. I was wondering why this didn't work anymore when it worked in 7.1. I
guess the change in SERIAL semantics where the unique index is no longer
created is what causes the problem. If I used PRIMARY KEY or create a
unique index manually on person.id, it works fine. It seems odd that one
cannot have a foreign key to a non-indexed column in another table.

Ed