| From: | Szymon Guz <mabewlun(at)gmail(dot)com> |
|---|---|
| To: | Karel Riveron Escobar <kescobar(at)estudiantes(dot)uci(dot)cu> |
| Cc: | bricklen <bricklen(at)gmail(dot)com>, PostgreSQL <pgsql-general(at)postgresql(dot)org>, Ian Lawrence Barwick <barwick(at)gmail(dot)com> |
| Subject: | Re: Random numbers |
| Date: | 2013-05-25 16:19:51 |
| Message-ID: | CAFjNrYt-kErJOv7TcSE3S+8CKOFo8NQwiJ6WNBEvG-ZSfB6fPA@mail.gmail.com |
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| Lists: | pgsql-general |
On 25 May 2013 18:14, Karel Riveron Escobar <kescobar(at)estudiantes(dot)uci(dot)cu>wrote:
> How would be if I would want to generate values among 3 and 5?
>
>
>
Hi Karel,
try something like:
SELECT floor(3 + random()*(5-3+1))::INT
Or generally:
CREATE OR REPLACE FUNCTION
random_range(INTEGER, INTEGER) RETURNS INTEGER
AS $$
SELECT floor(($1 + ($2 - $1 + 1) * random()))::INTEGER;
$$ LANGUAGE SQL;
and then:
SELECT random_range(3,5);
regards
Szymon
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