From: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
---|---|
To: | Lou Duchez <lou(at)paprikash(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Secret Santa List |
Date: | 2015-12-23 12:17:22 |
Message-ID: | CACjxUsON62C19ZQ38WVmjO8Z3v1A4479J0+Meb+ZPyFAz8-TuQ@mail.gmail.com |
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Lists: | pgsql-general |
On Tue, Dec 22, 2015 at 9:49 PM, Lou Duchez <lou(at)paprikash(dot)com> wrote:
> I have a company with four employees who participate in a Secret Santa
> program, where each buys a gift for an employee chosen at random. (For now,
> I do not mind if an employee ends up buying a gift for himself.) How can I
> make this work with an SQL statement?
>
> Here is my Secret Santa table:
>
> --
> create table secretsanta
> (giver text,
> recipient text,
> primary key (giver));
>
> insert into secretsanta (giver) values ('Frank'), ('Joe'), ('Steve'),
> ('Earl');
> --
with
g as (select giver, row_number() over () as rownum from secretsanta),
r as (select giver, row_number() over () as rownum from (select
giver from secretsanta order by random()) as x)
update secretsanta
set recipient = r.giver
from g join r on g.rownum = r.rownum
where secretsanta.giver = g.giver;
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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