Re: easy task: concurrent select-updates

Kevin McConnell wrote:
>> CREATE OR REPLACE FUNCTION public.getmsg() RETURNS integer LANGUAGE plpgsql
>> AS $function$
>> declare
>> rec record;
>> begin
>> for rec in select id from msg where busy =alse order by id loop
>> update msg set busy =rue where id = rec.id and busy = false;
>> if found then
>> return rec.id;
>> end if;
>> end loop;
>> return -1;
>> end;
>> $function$
>>
>
> I think you could also do something roughly similar in a statement by
> using a RETURNING clause on the update, such as:
>
> update msg set busy =rue where id = (select min(id) from msg where
> busy =alse) returning *;
>
> Cheers,
> Kevin
>

Thank you guys! But what's min(id) for? Is it neccessary? Is there any
chance I can replace min(id) to LIMIT 1?

Best regards, Nick.