一个mysql的问题，求助。。。

select a.mp,a.title,a.addtime,b.id2,b.point_spare,b.point_deduct from mp_mpactivity AS a left join sec_secretary AS b on a.mp=b.id2 where b.point_spare>='9' AND b.point_spare>=b.point_deduct order by a.addtime desc limit 0,6

上面的语句结果是得到符合条件的数据的前6条，我现在要得到符合数据的总个数，该怎么改？大家帮帮忙，谢谢了！

不要后面的limit
select a.mp,a.title,a.addtime,b.id2,b.point_spare,b.point_deduct from mp_mpactivity AS a left join sec_secretary AS b on a.mp=b.id2 where b.point_spare>='9' AND b.point_spare>=b.point_deduct order by a.addtime desc