On Nov 23, 2004, at 10:16 PM, Jeff Flowers wrote:
> I want to create a date column that contains only the year, such as
> YYYY. Can this done in PostgreSQL? I didn't see this listed in the
> handbook and right now, the only way I can see to do would be to create
> a numeric data field with zero scale and a precision of four.
You could do that, or create a domain that would restrict the date to
only be, say, CCYY-01-01, which would represent the year. Something
like:
test=# create domain date_year as date check (Date_trunc('year',value)
= value);
CREATE DOMAIN
test=# select '1990-01-01'::date_year;
date_year
------------
1990-01-01
(1 row)
test=# select '1990-02-01'::date_year;
ERROR: value for domain date_year violates check constraint
"date_year_check"
It'll throw an error if you try to enter a date that isn't on January 1
of that year.
Just an idea.
Michael Glaesemann
grzm myrealbox com