Woocommerce i try to help myself get more knowledge on SQL but i doesn't work

I’m not sure that I understand your english too well, sorry, but I think I understand you SQL…
I think you want to try something like this:

SELECT p.id, p.post_title, m.meta_key, m.meta_value
(FROM wp_posts p
INNER JOIN wp_postmeta m
ON p.id = m.post_id)
INNER JOIN wp_postmeta t
ON p.id = t.post_id
WHERE
AND t.meta_key='_rentable' AND t.meta_value='yes'
AND m.meta_key='_price'

… but I am not sure where to get the extra description that you want to add to the title. I would need to see your database to do more.

Please let me know if you need more help. You can contact me directly on my blog or send email to: wordpress at ieonly dot com

Sorry, but that doesn’t help much. those pages are really messy with all the HTML in the those table dumped onto them. It looks like the data you are looking for is in the post content which will be really hard to parse out for you needs. Maybe you would be happy with the whole content field though?

This is looking like a real job though, not just a little free advise. If you want to bring me on-board this project you can contact me directly and provide a WP Admin login. Email me directly if interested:
wordpress at ieonly dot com

Aloha, Eli

wordpress at ieonly dot com
or you can leave a comment on my blog and I’ll get back you directly.
blog links in the plugin sidebar in your WP admin.