Question

I was trying to run the following query

UPDATE blog_post SET `thumbnail_present`=0, `thumbnail_size`=0, `thumbnail_data`=''
WHERE `blog_post` NOT IN (
 SELECT `blog_post`
 FROM blog_post
 ORDER BY `blog_post` DESC
 LIMIT 10)

But Mysql doesn’t allow ‘LIMIT’ in an ‘IN’ subquery.

I think I can make a select to count the table rows and then make an ordered update limited by ‘COUNT – 10’, but I was wondering if there is a better way.

Thanks in advance.

Answer 1

think i understood you right:

update blog_post bp
left outer join
(
select 
 post_id -- what's your PK again ??
from 
 blog_post
order by
 post_id desc limit 10
) latest on latest.post_id = bp.post_id
set 
  bp.thumbnail_present = 0 -- add more fields
where
 latest.post_id is null;

EDIT

I’ve renamed the fields as you can’t seem to take a hint !

update blog_post bp
left outer join
(
select 
 blog_post 
from 
 blog_post
order by
 blog_post desc limit 10
) latest on latest.blog_post = bp.blog_post
set 
  bp.thumbnail_present = 0
where
 latest.blog_post is null;