在同一個表

Question

從其減去兩個不同的列從2個選擇我有這兩個查詢如下：

SELECT globalid, name, price, sum(qnt) as pozitive 
from main 
where [date-out] is null 
group by globalid, name, price; 

此查詢給出了不同的項目數量的總和兩種類型的日期，日期創建和date-in。

SELECT globalid, sum(qnt) as negative 
from main 
where [date-out] is not null 
group by globalid; 

此查詢給出日期出 -s取出不同物品的儲存數量的總和。

我要讓具有以下字段的數據集：

globalid - 名 - 價格 - 股票 - 出售 - 總

我有在網上找到了一些例子，但是，它們主要與計數函數有關，或者如果總和，只有一個查詢有一個條件，而不是兩個。我正在使用SQL Server，任何幫助表示讚賞。

Answer 1

好像你可以使用CASE與SUM - 不需要任何的子查詢：

SELECT 
    globalid, 
    name, 
    price, 
    sum(case when [date-out] is null then qnt end) positive, 
    sum(case when [date-out] is not null then qnt end) negative, 
    sum(qnt) total 
from main 
group by 
    globalid, 
    name, 
    price 

Answer 2

select x.globalid, x.name, x.price, x.positive as [in stock], x.negative as [sold], x.positive + x.negative as [total] 
from 
(
SELECT globalid, 
      name, 
      price, 
    sum(case when [date-out] is not null then qnt else 0 end) as negative, 
    sum(case when [date-out] is null then qnt else 0 end) as positive 
from main 
where [date-out] is not null 
group by globalid, name, price 
) as x