sql server 2012 : how to optimize this like % query - sql-server

Question

This query takes too much time, so I try to optimize it. Do you have any idea or suggestion ?
I tried with fulltext on a procedure and a while loop ... it gets worst ( dbo.url has more than 100 000 lines ; dbo.url where status = 'tocheck' only 1000)
select tocheck.*
from dbo.url tocheck inner join dbo.url done
on tocheck.id != done.id
and tocheck.url like done.url+'%'
and done.status in ('tocheck','todo','done')
where tocheck.status = 'tocheck'
Edit :
I call a webservice multiple times with different urls :
urls look like http://ws.com/query?p1=a&p2=b (url1).
If I already called url http://ws.com/query?p1=a (url2), i don't want to call url1 cause :
url1 like url2+'%'
Thanks for your help.
Edit2 :
I add a column suburl that contains 'query?p1=a' for each url and modify the query :
select tocheck.*
from dbo.url tocheck inner join dbo.url done
on tocheck.id != done.id
and tocheck.suburl = done.suburl --NEW
and tocheck.url like done.url+'%'
and done.status in ('tocheck','todo','done')
where tocheck.status = 'tocheck'
More than 10 times shorter ... Phew !!

Answer 1

I think because of joining the table to itself through ids not equal there is much overhead as this is a cartesian product only excluding self joins for same id.
I suggest trying with a subquery. Then the outer query returns only 1000 (as you mentioned) tochecks whereas the subquery additionally excludes urls starting with the same characters:
select
tocheck.*
from
dbo.url tocheck
where
tocheck.status = 'tocheck'
and
tocheck.id not in (
select
done.id
from
dbo.url done
where
tocheck.url like done.url+'%'
and
done.status in ('tocheck','todo','done')
)