这个sql语言会不会好些？

select a.* 

from TxComments a
inner join
(select permlink,
min(tx_id) as tx_id
from TxComments
where author = 'incrediblesnow' and title <> ''
group by permlink
) as b
on a.tx_id = b.tx_id and
a.permlink = b.permlink
order by a.tx_id desc