Getting back urls while loading multiple urls with YQL

Getting back urls while loading multiple urls with YQL

I'm using YQL to fetch a bunch of pages, some of which could be offline
(obviously I don't know which ones). I'm using this query:
SELECT * FROM html WHERE url IN ("http://www.whooma.net",
"http://www.dfdsfsdgsfagdffgd.com", "http://www.cnn.com")
Where the first and the last one are actual sites, while the second one
obviously doesn't exist. Two results are actually returned but the url
from where they were loaded doesn't appear anywhere. So what would be the
way to find out which html page belongs to which url, if not every page in
the query is loaded?
Thank you very much indeed!
Matteo