Ето пример с три таблици, които вероятно могат да ви помогнат да започнете.
DB схема
CREATE TABLE users
(user_id int auto_increment PRIMARY KEY,
user_name varchar(32));
CREATE TABLE agenda
(agenda_id int auto_increment PRIMARY KEY,
`user_id` int, `agenda_name` varchar(7));
CREATE TABLE events
(event_id int auto_increment PRIMARY KEY,
`agenda_id` int,
`event_name` varchar(8));
SP за клониране на потребител с неговия дневен ред и записи на събития
DELIMITER $$
CREATE PROCEDURE clone_user(IN uid INT)
BEGIN
DECLARE last_user_id INT DEFAULT 0;
INSERT INTO users (user_name)
SELECT user_name
FROM users
WHERE user_id = uid;
SET last_user_id = LAST_INSERT_ID();
INSERT INTO agenda (user_id, agenda_name)
SELECT last_user_id, agenda_name
FROM agenda
WHERE user_id = uid;
INSERT INTO events (agenda_id, event_name)
SELECT a3.agenda_id_new, e.event_name
FROM events e JOIN
(SELECT a1.agenda_id agenda_id_old,
a2.agenda_id agenda_id_new
FROM
(SELECT agenda_id, @n := @n + 1 n
FROM agenda, (SELECT @n := 0) n
WHERE user_id = uid
ORDER BY agenda_id) a1 JOIN
(SELECT agenda_id, @m := @m + 1 m
FROM agenda, (SELECT @m := 0) m
WHERE user_id = last_user_id
ORDER BY agenda_id) a2 ON a1.n = a2.m) a3
ON e.agenda_id = a3.agenda_id_old;
END$$
DELIMITER ;
За клониране на потребител
CALL clone_user(3);
Ето SQLPiddle демонстрация.