SELECT * FROM newsy LIMIT 5
oraz
SELECT count(*) FROM komentarze WHERE n_id=newsy.id
niemam pomysłu jak mogę to zrobić

SELECT k.* FROM newsy n, komentarze k WHERE n.id = k.id_newsa AND n.id = $id_newsa;
SELECT count(*) , n.nazwa, n.id_newsa FROM newsy n, komentarze k WHERE n.id = k.id_newsa GROUP BY n.nazwa, n.id_newsa ;
SELECT count(*) , n.nazwa, n.id_newsa FROM newsy n, komentarze k WHERE n.id = k.id_newsa GROUP BY n.nazwa, n.id_newsa HAVING count(*) > 0;