Message-ID: <532A1B97.4000902@dalibo.com>
Date: Wed, 19 Mar 2014 23:35:03 +0100
From: Vik Fearing <vik.fearing@dalibo.com>
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To: Sergey Konoplev <gray.ru@gmail.com>, AlexK <alkuzo@gmail.com>
CC: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: Can I use a constraint to make sure all array elements
 are positive?
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On 03/19/2014 11:20 PM, Sergey Konoplev wrote:
> 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}).

D'oh!

Much better than my solution.

-- 
Vik


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