Question

我目前正在尝试编写一个select语句，用于计算单个列中的年度总和。

我面临的问题是有几种不同的付款频率，例如我必须将每月的数量乘以12以获得年度，每季度增加4，半年增加2等。

我在下面写了一个声明，但是它要求我按频率和数量字段进行分组，这会产生不希望的结果。

select (case when Frequency='month' then SUM(cast(Amount as decimal(10,2))*12) 
else (case when Frequency='quarter' then SUM(cast(Amount as decimal(10,2))*4) 
else (case when Frequency='year' then SUM(cast(Amount as decimal(10,2))*1) 
else (case when Frequency='six months' then SUM(cast(Amount as decimal(10,2))*2) end) 
end)
end) end) as 'Total Annual Amount' 
from Table group by Frequency

我知道我可能会在解决这个问题时咆哮错误的树，但上面是我最接近的。

希望我有足够的描述性，如果你需要我进一步详细说明，请告诉我

Answer 1

尝试将您的金额移到案例之外：

select
sum (case when Frequency='Month' then (cast(amount as decimal(10,2))*12
     when Frequency='quarter' then...
end) as [Total Annual Amount]

Answer 2

您也可以使用WITH AS（假设是ORACLE）......

WITH dmap AS
 ( select 'Month' as duration, 12 as mult from dual
   UNION
   select 'Year' as duration, 1 as mult from dual
   UNION
   select 'Quater' as duration, 4 as mult from dual
   UNION
   select 'six months' as duration, 2 as mult from dual
 ) 
select sum(cast(Amount as decimal(10,2)) * mult)
from tab, dmap
where duration = frequency;

计算付款频率不同时的年度金额之和

2 个答案: