join problem or maybe group :(

Hi All

I want to select sections using left join on articles, but i want to retrive
only one row from articles per section and the one should be the latest
art_date.

Can it be done ?

CREATE TABLE sections (
sec_id SERIAL PRIMARY KEY,
sec_name VARCHAR (30),
sec_order INT2
);

CREATE TABLE articles (
art_id SERIAL PRIMARY KEY,
sec_id INT4 REFERENCES sections ON UPDATE CASCADE ON DELETE CASCADE,
art_name VARCHAR (30),
art_date DATE
);

Cheer