How to automate insert id into child table with new created id from parent

How to make as 开发者_如何学Cdefault insert with id_user into child user_id? I will make at once update without extra select and insert in my program. Is this possible?

CREATE TABLE IF NOT EXISTS `users` (
  `id_user` int(10) NOT NULL AUTO_INCREMENT,
  `name` varchar(25) NOT NULL DEFAULT '',
  PRIMARY KEY (`id_user`)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS  `scores` (
 `user_id` INT( 10 ) NOT NULL DEFAULT  '0',
 `score` INT( 10 ) NOT NULL DEFAULT  '0',
PRIMARY KEY (`user_id`),
CONSTRAINT FOREIGN KEY ( `user_id` ) REFERENCES  `users` ( `id_user` )
    ON UPDATE CASCADE
) ENGINE = INNODB;

INSERT INTO users (name) VALUES ('i am');

UPDATE scores SET score = '10' WHERE user_id = '1';

Not sure I understand the example. If you just inserted user number 1, how come there is a record in scores with user_id = 1?.

Anyway, If your question is how to get the id of the user you just inserted into users so you can insert a child record into scores, you can run

SELECT LAST_INSERT_ID();

after the first insert, and use the result for the second insert (/update).