MySQL求百分率

报表业务要求求字段分类在表中百分率，SQL如下（SQL中表为本人业务表，须更改）：
Mysql代码 
SELECT biz_type,round((sumCate/sumCount)*100,2) as percent 
From (select biz_type, count(id) as sumCate from sta_report group by biz_type) as a, 
(select count(id) as sumCount from sta_report) as  b 
 
结果只需加上“%”即可，已经乘以了“100”，且已经把结果截断为只含二位小数。
附SQL中取小数点后两位语句：
select round(小数，2) from 表
select convert(decimal(18,2),round(小数,2)) from 表
select cast(小数 as numeric(10,2)) from 表

作者“愤怒的三米”