SELECT p.product_name, COUNT(c.hits) AS licznik FROM product p LEFT JOIN counter c ON (c.product_id = p.product_id)
Wynikiem mam jeden produkt a nie jego lista.
Co jest zle?
SELECT p.product_name, COUNT(c.hits) AS licznik FROM product p LEFT JOIN counter c ON (c.product_id = p.product_id) GROUP BY p.product_name