mysql 语法错误

多个逗号都要报错，能不能智能点

CREATE TABLE tree ( 
    tree_id INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(30), 
    `img_url` VARCHAR(100), 
    `user_id` INT, 
    CONSTRAINT `fk_user_id` FOREIGN KEY (`user_id`) REFERENCES user(`user_id`), --这里不能带，
);

CREATE TABLE `node` ( 
    `node_id` INT PRIMARY KEY auto_increment, 
    `name` VARCHAR(32), 
    `img_url` VARCHAR(100), 
    `parent_id` INT, 
    `tree_id` INT, 
    CONSTRAINT `fk_tree_id` FOREIGN KEY (tree_id) REFERENCES tree(tree_id) -- foreign key 后面要跟小括号
);