私はtotal_Amountを合計する必要があります。title = incomeとtitle =経費

Question

タイトルに基づいてtotal_amountを合計する必要があります。実際に私はこれらの2つのテーブルの間に関係はありませんが、貯蓄を取り出すために、私はそれらを合計し、両方の合計の合計を差し引く必要があります。

ALTER PROCEDURE [dbo].[SpSavingDetail] 
@year varchar(10), 
@month varchar(10) 
AS 
BEGIN 

SET NOCOUNT ON; 

declare @Saving int 

select e.Date_time as Date_time ,c.category as Particular,e.Description as Description ,e.Amount as Amount, 
e.Frequency as Frequency,e.Total_Amount as Total_Amount,'Expense' as Title from tbl_expense as e 
left join tbl_category as c on c.Cat_id=e.Cat_id where datepart(MM,e.Date_time)=@month and datepart(YYYY,e.Date_time)=@year 
union 
select i.Date_time as Date_time ,s.source as Particular,i.Description as Description ,i.Amount as Amount, 
i.Frequency as Frequency,i.Total_Amount as Total_Amount,'Income' as Title from tbl_income as i 
left join tbl_source as s on s.Source_id=i.Source_id 
where datepart(MM,i.Date_time)=@month and datepart(YYYY,i.Date_time)=@year 





    [1]: http://i.stack.imgur.com/8Z5po.jpg 

Answer 1

私は（あなたがより適切に質問をタグ付けしている場合は、より多くの運を持っているでしょう？それはT-SQLである）、この言語を知らないが、あなたは、次の線に沿って何かを行うことができるはず：

declare @expense int 
declare @income int 

select @expense = SUM(e.Amount) 
    from tbl_expense as e 
where datepart(MM,e.Date_time)=@month and datepart(YYYY,e.Date_time)=@year 

select @income = SUM(i.Amount) 
    from tbl_income as i 
where datepart(MM,i.Date_time)=@month and datepart(YYYY,i.Date_time)=@year 

@Saving = @income - @expense