Re: Can I use a constraint to make sure all array elements are positive?

On Wed, Mar 19, 2014 at 2:59 PM, AlexK <alkuzo@gmail.com> wrote:
> One of the columns in my table is FLOAT[] NOT NULL. Can I use a constraint to
> make sure all array elements are positive?

Sure, you can. Use all() in the CHECK constraint:

CREATE TABLE c (f float[] NOT NULL CHECK (0 < all(f)));
CREATE TABLE

INSERT INTO c VALUES (array[1,2,3]);
INSERT 0 1

INSERT INTO c VALUES (array[1,2,3,0]);
ERROR:  new row for relation "c" violates check constraint "c_f_check"
DETAIL:  Failing row contains ({1,2,3,0}).

-- 
Kind regards,
Sergey Konoplev
PostgreSQL Consultant and DBA

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