Question

I get this error:

You can’t specify target table ‘wp_mail_queue’ for update in FROM
clause

Because of this query:

DELETE FROM wp_mail_queue 
WHERE message_id = (SELECT message_id FROM wp_mail_queue ORDER BY id LIMIT 0, 1)
ORDER BY wp_mail_queue.id 
LIMIT 100

And I suppose it results from the subquery. Replace DELETE with SELECT * and it returns exactly the entries that I want to delete. What I need is a way to rewrite this so that I won’t need to query wp_mail_queue in that subquery, or avoid the subquery entirely.

My thoughts went first to variables, if I could somehow assign the subquery to one and then use that?

Answer 1

Try:

DELETE FROM wp_mail_queue 
WHERE message_id = (SELECT * FROM (SELECT message_id FROM wp_mail_queue ORDER BY id LIMIT 0, 1) queue_table)
ORDER BY wp_mail_queue.id 
LIMIT 100