SQL查询 - 如何获得行的单元格的倍数总和的差异

我需要获得单个表格中两个字段的总和的差异（真的很抱歉，如果这是令人困惑），请阅读例子SQL查询 - 如何获得行的单元格的倍数总和的差异

 
Id type account_id stock_id volume price value 
========================================================== 
1 BUY  1   1    5  500  2500 
2 BUY  1   4   30  200  6000 
6 BUY  1   1   10  500  5000 
7 SELL  1   1    3  500  1500 
8 SELL  1   1    2  500  1000 
9 SELL  1   4   20  120  2400

以上就是我的样本数据，我将我的SQL查询结果是这样的，

 
account_id stock_id volume totalAmount 
============================================ 
1   1   10  5000 
1   4   10  3600

基本上在这里，我想获得的唯一帐户&股票组合的总购买价值减去总销售价值为

任何帮助在这里将不胜感激。

在此先感谢

来源

2014-09-20 abdulH

你有没有尝试过的东西，以获得预期的结果？ – 2014-09-20 20:26:53

小提琴测试： http://sqlfiddle.com/#!2/53035/1/0

select account_id, 
     stock_id, 
     sum(case when type = 'BUY' then volume else -volume end) as volume, 
     sum(case when type = 'BUY' then value else -value end) as totalamount 
from  tbl 
group by account_id, 
     stock_id 
having sum(case when type = 'BUY' then volume else -volume end) <> 0

我增加了一个基于您的评论HAVING子句。

来源

2014-09-20 20:28:41

正是我想要的......太快了。非常感谢:) – abdulH 2014-09-20 20:40:40

如何避免结果总和（如果type ='BUY'then volume else -volume end）的结果为ZERO？ – abdulH 2014-09-20 21:36:50

@aaha使用having子句，请参阅编辑答案 – 2014-09-20 21:38:14

只是为了减少重复我会改变Brian的代码如下：

SELECT 
    account_id, 
    stock_id, 
    SUM(volume * type_sign) as total_volume, 
    SUM(value * type_sign) as total_value 
FROM 
    (select t.*, case when type = 'BUY' then 1 else -1 end as type_sign 
    from tbl) t 
GROUP BY account_id, 
     stock_id

来源

2014-09-20 20:42:52 Bulat

select buy.account_id,buy.stock_id,(buy.volume-sell.volume) volume,(buy.totalAmount-sell.totalAmount) totalAmount from 
(select account_id,stock_id,sum(volume) volume,sum(value) totalAmount from stock 
where type = 'BUY' 
group by account_id,stock_id) buy 
inner join 
(select account_id,stock_id,sum(volume) volume,sum(value) totalAmount from stock 
where type = 'SELL' 
group by account_id,stock_id) sell 
on buy.account_id = sell.account_id and buy.stock_id = sell.stock_id

来源

2014-09-20 21:37:14 Ammaroff

SQL查询 - 如何获得行的单元格的倍数总和的差异

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