Как правильно составить запрос?

CREATE TABLE Ships (
id_ship INT NOT NULL PRIMARY KEY COMMENT 'Номер корабля',
name_ship CHAR(40) NOT NULL COMMENT 'Название корабля',
displacement INT NOT NULL COMMENT 'Вес корабля',
place CHAR(30) NOT NULL COMMENT 'Расположение',
id_captain INT NOT NULL COMMENT 'Номер капитана' FOREIGN KEY REFERENCES Captains (id_captain))

CREATE TABLE Sea_ports (
id_port INT NOT NULL PRIMARY KEY COMMENT 'Номер порта',
name_port CHAR(30) NOT NULL COMMENT 'Название порта',
counrty CHAR(30) NOT NULL COMMENT 'Месторасположение',
type_port CHAR(30) NOT NULL COMMENT 'Тип порта')

CREATE TABLE Working_Days (
id_day INT NOT NULL PRIMARY KEY COMMENT 'Номер рабочего дня',
input_day DATETIME NOT NULL COMMENT 'Дата прихода',
output_day DATETIME NOT NULL COMMENT 'Дата выхода',
objective CHAR(40) NOT NULL COMMENT 'Цель',
id_ship INT NOT NULL FOREIGN KEY REFERENCES Ships(id_ship)
id_port INT NOT NULL FOREIGN KEY REFERENCES Sea_ports(id_port)

SELECT DISTINCT sea_ports.country AS 'Страны' FROM sea_ports, working_days, ships
WHERE (working_days.objective <> 'Туризм') AND (working_days.id_ship = ships.id_ship) AND (working_days.id_port = sea_ports.id_port);

SELECT DISTINCT SP.counrty FROM Sea_ports SP
LEFT JOIN Working_Days WD ON SP.id_port = WD.id_port AND WD.objective = 'Туризм'
WHERE WD.id_port IS NULL