How to join only one row in joined table with postgres?

Question

I have the following schema:

CREATE TABLE author (
    id   integer
  , name varchar(255)
);
CREATE TABLE book (
    id        integer
  , author_id integer
  ,          


        

Answer 1

create temp table book_1 as (
SELECT
id
,title
,author_id
,row_number() OVER (PARTITION BY id) as rownum 
FROM
book)  distributed by ( id );

select author.id,b.id, author.id, author.name, b.title as last_book
from
    author

    left  join
   (select * from  book_1 where rownum = 1 ) b on b.author_id = author.id
order by author.id, b.id desc