java - 在 SQL 中计算百分比

Question

我有一个表，其中包含两种类型的信息，一种称为Number_Of_Calls，另一种称为Number_Of_Answered。

现在在我的应用程序中，我想获得百分比的百分比，Number_of_answered并且Number_of_calls我认为在数据库中计算将是最好的方法。

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'

Answer 2

select 
Number_Of_Calls,
Number_of_answered
((Number_of_answered/Number_Of_Calls)*100.00) as percent
from table_name Where Date BETWEEN '2012-09-10' AND '2012-09-11'