计算SQL中的百分比

Question

我有一个表包含两种类型的信息,一种叫做Number_Of_Calls,另一种叫做Number_Of_Answered.

现在,在我的应用我想获得多少百分比Number_of_answered是的Number_of_calls,我想通了数据库中计算会做到这一点的最好办法.

但是我不知道如何在SQL中计算

到目前为止,我有:

Select Number_Of_Calls,
       Number_of_answered 
  from table 
 Where Date BETWEEN '2012-09-10' AND '2012-09-11'

Answer 1

select 
Number_of_Calls,
Number_of_Answered,
((Number_of_answered/Number_Of_Calls)*100) as answer_percent,
Date
from table Where Date BETWEEN '2012-09-10' AND '2012-09-11'