Fixup of foreign key example (noted by Jose Freitas).

    id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,

    style ENUM('t-shirt', 'polo', 'dress') NOT NULL,

    color ENUM('red', 'blue', 'orange', 'white', 'black') NOT NULL,

    owner SMALLINT UNSIGNED NOT NULL REFERENCES persons,

    owner SMALLINT UNSIGNED NOT NULL REFERENCES person(id),

    PRIMARY KEY (id)

);