文章分组统计后的，在的到总行数，为什么有错？？？
文章分组统计后的，在的到总行数，为什么有错？？？

select   count(*)   from   (select   author,count(*)   from   articles   group   by   author)


------解决方案--------------------
select count(*) from (select author,count(*) from articles group by author) AS a