Delete Duplicate Posts From Like Category

My website has about 200k posts so naturally there are bound to be some duplicates. I’ve found this bit of mySQL:

[code]
DELETE bad_rows.*
from wp_posts as bad_rows
inner join (
select post_title, MIN(id) as min_id
from wp_posts
group by post_title
having count(*) > 1
) as good_rows on good_rows.post_title = bad_rows.post_title
and good_rows.min_id bad_rows.id
[/code]

Only problem is it deletes posts with like titles. This won’t do. Any idea how to modify this so it only deletes duplicate posts in each category?