On Fri, Aug 21, 2020 at 4:36 PM Bruce Momjian <bruce@momjian.us> wrote:
On Wed, Aug 5, 2020 at 11:29:31PM -0700, David G. Johnston wrote:
> Removing "char" from the tutorial is a nice side-effect that we probably want > to do even if we keep "state".
I think CHAR(2) is fine because it is always 2 characters.
You imply "it is always two non-blank characters" though that isn't what CHAR(2) means. Adding CHECK (state ~ '^[A-Z]{2}$') and leaving the type as text would be best from a pure model perspective - but this isn't the place to teach that and for the same reason char(2) isn't terrible.
How is the attached patch, based on your suggestions?