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Re: update with select in MYSQL
Posted by: chris trahey
Date: May 13, 2009 02:51PM

Maybe this has been solved already, but here is a (somewhat) simple solution using INSERT with ON DUPLICATE KEY UPDATE

My example is updating a payments table with a most recent payment_status row id.
Payments table has a unique "id", and a "cur_stat_id" which is what we are trying to populate with the most recent matching record from a related table (payment_status).

INSERT INTO payments (id, cur_stat_id) SELECT id, x.statid FROM payments JOIN (SELECT payment_id, max(id) as statid FROM payment_status GROUP BY payment_id) as x ON payments.id=x.payment_id ON DUPLICATE KEY UPDATE payments.cur_stat_id=x.statid

There may be a somewhat shorter route to this (i.e. only naming the id col in the field list and select clause), but you can catch the idea. Basically, we are inserting a known duplicate key to take advantage of the update capabilities of this construct in tandem with the select capabilities of insert ... select.



Edited 1 time(s). Last edit at 05/13/2009 03:51PM by chris trahey.

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