WITH deleted AS (
  DELETE from users_liked_restaurants
  WHERE users_liked_restaurants.user_id = 1
    AND users_liked_restaurants.restaurant_id = 2
  RETURNING restaurant_id
)
SELECT restaurants.restaurant_id,
       restaurants.title
FROM restaurants
   LEFT JOIN users_liked_restaurants
      ON users_liked_restaurants.restaurant_id = restaurants.restaurant_id
WHERE users_liked_restaurants.user_id = 1
  AND NOT EXISTS (
         SELECT 1 FROM deleted
         WHERE deleted.restaurent_id = restaurants.restaurant_id
      );