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From Bruno Wolff III <br...@wolff.to>
Subject Re: [SQL] Unique Constraint with foreign Key
Date Tue, 10 Feb 2004 20:15:21 GMT
On Tue, Feb 10, 2004 at 12:03:36 -0500,
  mohan@physics.gmu.edu wrote:
> Hi all i am using postgres and torque
> I have a column x in Table A of type varchar and NOT NULL. I want to
> impose a unique key constraint on that table and column y is the primary
> key.
> I have another Table B with column x. can i make this column x as a
> foreign key on column x in table A.

Yes. The reference will need to specify column x, since the primary key
column (y) will be the default.

> or Can i have varchar types  of size 50 as primary keys in Postgres.

Yes. But unless the 50 character limit comes from a business rule, you
might want to use the type 'text'.

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