MySQL conditional row update based on other tables - mysql

Question

I have the following MySQL tables:
CREATE TABLE notification
(`id` int, `person_id` int, `rule_id` int, `account_id` int, `account_display_name` varchar(16))
;
INSERT INTO notification
(`id`, `person_id`, `rule_id`, `account_id`, `account_display_name`)
VALUES
(1, 1, 1, 1, 'Muad''Dib'),
(2, 1, 1, 2, 'Kwisatz Haderach'),
(3, 1, 2, 2, 'Kwisatz Haderach'),
(4, 2, 1, 3, 'Duncan'),
(5, 2, 2, 4, 'Duncan Idaho')
;
CREATE TABLE person
(`id` int, `name` varchar(6), `organization_id` int)
;
INSERT INTO person
(`id`, `name`, `organization_id`)
VALUES
(1, 'paul', 1),
(2, 'duncan', 1),
(3, 'paul', 2),
(4, 'duncan', 2),
(5, 'paul', 3),
(6, 'duncan', 3)
;
CREATE TABLE account
(`id` int, `display_name` varchar(16), `person_id` int)
;
INSERT INTO account
(`id`, `display_name`, `person_id`)
VALUES
(1, 'Muad''Dib', 1),
(2, 'Kwisatz Haderach', 1),
(3, 'Duncan', 2),
(4, 'Duncan Idaho', 2),
(5, 'Muad''Dib', 3),
(6, 'Kwisatz Haderach', 3),
(7, 'Duncan', 4),
(8, 'Duncan Idaho', 4),
(9, 'Muad''Dib', 5),
(10, 'Kwisatz Haderach', 5),
(11, 'Duncan', 6),
(12, 'Duncan Idaho', 6)
;
CREATE TABLE organization
(`id` int, `name` varchar(17))
;
INSERT INTO organization
(`id`, `name`)
VALUES
(1, 'atreides'),
(2, 'atreides_dev'),
(3, 'atreides_research')
;
CREATE TABLE rule
(`id` int, `name` varchar(14))
;
INSERT INTO rule
(`id`, `name`)
VALUES
(1, 'bug'),
(2, 'false_positive')
;
Conceptually, the system in question generates a notification when an event occurs that is considered relevant to person. Whether or not a notification gets generated is determined by rule (the relation between person and rule is defined elsewhere, but that's outside the scope of this question). Every notification that gets generated for a person is specifically related to an account owned by that person, and it also contains the (denormalized) account_display_name of the account.
Notice that a person is also related to exactly one organization.
Currently, I have a set of notifications (with related accounts) for multiple persons in a particular organization. But I need to move these notifications to different replica organizations (with replica persons and accounts) based on the rule that caused the notification.
Below is an example of the type of migration I'm trying to perform.
State of related tables
person
+----+--------+-----------------+
| id | name | organization_id |
+----+--------+-----------------+
| 1 | paul | 1 |
| 2 | duncan | 1 |
| 3 | paul | 2 |
| 4 | duncan | 2 |
| 5 | paul | 3 |
| 6 | duncan | 3 |
+----+--------+-----------------+
organization
+----+-------------------+
| id | name |
+----+-------------------+
| 1 | atreides |
| 2 | atreides_dev |
| 3 | atreides_research |
+----+-------------------+
account
+----+------------------+-----------+
| id | display_name | person_id |
+----+------------------+-----------+
| 1 | Muad'Dib | 1 |
| 2 | Kwisatz Haderach | 1 |
| 3 | Duncan | 2 |
| 4 | Duncan Idaho | 2 |
| 5 | Muad'Dib | 3 |
| 6 | Kwisatz Haderach | 3 |
| 7 | Duncan | 4 |
| 8 | Duncan Idaho | 4 |
| 9 | Muad'Dib | 5 |
| 10 | Kwisatz Haderach | 5 |
| 11 | Duncan | 6 |
| 12 | Duncan Idaho | 6 |
+----+------------------+-----------+
rule
+----+----------------+
| id | name |
+----+----------------+
| 1 | bug |
| 2 | false_positive |
+----+----------------+
Initial state of notifications
+----+-----------+---------+------------+----------------------+
| id | person_id | rule_id | account_id | account_display_name |
+----+-----------+---------+------------+----------------------+
| 1 | 1 | 1 | 1 | Muad'Dib |
| 2 | 1 | 1 | 2 | Kwisatz Haderach |
| 3 | 1 | 2 | 2 | Kwisatz Haderach |
| 4 | 2 | 1 | 3 | Duncan |
| 5 | 2 | 2 | 4 | Duncan Idaho |
+----+-----------+---------+------------+----------------------+
End state of notifications
+----+-----------+---------+------------+----------------------+
| id | person_id | rule_id | account_id | account_display_name |
+----+-----------+---------+------------+----------------------+
| 1 | 3 | 1 | 5 | Muad'Dib |
| 2 | 3 | 1 | 6 | Kwisatz Haderach |
| 3 | 5 | 2 | 10 | Kwisatz Haderach |
| 4 | 4 | 1 | 7 | Duncan |
| 5 | 6 | 2 | 12 | Duncan Idaho |
+----+-----------+---------+------------+----------------------+
As you can see, the person_id and account_id of the notifications have been updated based on the notification's rule_id. Specifically:
Every notification generated by the bug rule (ID 1) was moved to the corresponding person and account replicas in the atreides_dev organization (ID 2).
Every notification generated by the false_positive rule (ID 2) was moved to the corresponding person and account replicas in the atreides_research organization (ID 3).
I've written a SQL query that (I believe) selects the correct notification.person_id and notification.account_id based on notification.rule_id, but I'm unsure of the best way to use this in an UPDATE statement, such that every notification gets updated correctly.
Here is the SELECT:
select p_replica.id, acc_replica.id as account_id
from (select p.name, person_id, rule_id, account_id, account_display_name from notification n
inner join person p
on n.person_id = p.id
where p.organization_id = 1
and n.rule_id in (1)) as notifications
inner join person p_replica
on p_replica.name = notifications.name
and p_replica.organization_id = 2
inner join account acc_replica
on acc_replica.person_id = p_replica.id
and acc_replica.display_name = notifications.account_display_name;
Notice that the SELECT specifies an origin organization (ID 1), a destination organization (ID 2), and a rule whose notifications need to be migrated. Recall that this is based on a mapping of rule to destination organization. In other words, selecting all updated notifications would require one execution of this query per mapping of rule -> organization.
What would an UPDATE query for performing this migration look like?
Here is a SQL Fiddle to play around with.