如何在select查询中计算利润

Question

以下是我用于计算月收入和费用的选择查询

select sum(dr)exp,sum(cr) inc 
from vMonthlyExpenses

这将返回

exp              inc 
$14,751,199.09   $14,800,985.09

所以我的问题是如何获得利润值以及上面的选择，预期结果是

exp              inc            profit
$14,751,199.09   $14,800,985.09 $49,786.00

Answer 1

SELECT sum(dr) exp,
       sum(cr) inc,
       sum(cr)-sum(dr) profit 
FROM   vMonthlyExpenses