``请教一个SQL的写法``很急```
```````我用的是一个人员信息表``
现在存在这个SQL```````
select count(distinct R.emp_id) from report_address as R,employee as E where E.emp_id=R.emp_id group by sign_date
我想对所求列进行磊加``
应该怎么写语句啊``

[解决办法]
意思？

Select SUM(countemp_id) From (select count(distinct R.emp_id) As countemp_id from report_address as R,employee as E where E.emp_id=R.emp_id group by sign_date) A