CREATE TABLE `students`
(
    `id`   INTEGER PRIMARY KEY AUTO_INCREMENT,
    `name` TEXT    NOT NULL,
    `age`  INTEGER NOT NULL
);

-- добавление

INSERT INTO `students`
    (`name`, `age`)
VALUES
    ('Anna',   15),
    ('Ryan',   16), ('Joanna', 16), ('Danil', 16),
    ('Johan',  17),
    ('Petia',  18),
    ('Slava',  19),
    ('Osipov', 21),
    ('Nastya', 22),
    ('Igor',   23), ('Polina', 23), ('Katia', 23),
    ('Rislan', 24), ('Liza',   24), ('Dasha', 24),
    ('Adam',   25), ('Maksim', 25), ('Ivan',  25), ('Egor',   25), ('Pavel',  25),
    ('Lev',    26), ('Kirill', 26), ('Vadim', 26), ('Victor', 26), ('Leonid', 26);

-- удаление
-- DELETE FROM `students` WHERE `age` IN (16, 25, 26);

-- выборка
-- SELECT * FROM `students` WHERE `age` = 23;

-- сортировки
SELECT * FROM `students` ORDER BY `name` ASC;

-- SELECT * FROM `students`;