[SQL] LEFT JOIN

[Antti Linno]

Greetings.
 I have a problem. I have 2 tables. E.g. work and workers. I want to
select records, that 1st table has, and the second hasn't(both have id
attribute). I mean I can't do it with is NULL, because those records don't
exist. I was shown, how it is done with mysql

select first.id,second.id_first 
from first left join second on
id=id_first where id_first is NULL;

but when I tried it in psql, it said, not implemented.

Antti