Tutorial Preparation

CREATE TABLE users_backup (
    USER_ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    first_name VARCHAR(55),
    fav_color VARCHAR(20),
    has_pets TINYINT
);
INSERT INTO users_backup
(USER_ID, first_name, fav_color, has_pets)
VALUES
(NULL, "Bob", "blue", 6),
(NULL, NULL, "Green", 3),
(NULL, "Susie", "brownbrownbrown", 1),
(NULL, "Cindy", "green", 4),
(NULL, "Brian", "red", 3),
(NULL, "REbecca", "white", 3),
(NULL, "Daniel", "blue", 1),
(NULL, "Tim", "orange", 3),
(NULL, "Danielle", "babyblue", 1)