总结SQL中的值不起作用

Question

我有一个表[交易]，用于存储玩金枪鱼的玩家的交易价值。房子可以给予信用（在游戏中购买并稍后付款）或借记（手头支付现金）。有四种类型的交易（借方，贷方）和（'信用结算' - 客户偿还他欠的部分或全部，以及'借方结算' - 如果房子向玩家欠钱，则由房屋支付）。我要做的是找到平衡点。我已经尝试了很多sql语句，但我总是遗漏一些东西而且余额不正确。

一个简单的场景是：客户走进来，购买300美元的信用额度。他兑现了100，所以他欠房子200。他第二天来了，买了100个积分（所以现在他欠300）并最终兑现1000.房子给他500美元，但欠他200多。房子向客户支付200，因此存储为“借方结算”。

这是我到目前为止的结果，但结果并不总是正确的：

SELECT     SUM(Cashout)  - ((SELECT     COALESCE (SUM(Paid), 0) AS Expr1
                            FROM          [Transaction]
                            WHERE      (Type = 'Credit Settlement'))  + SUM(Buyin) +
                          (SELECT     COALESCE (SUM(Paid), 0) AS Expr1
                            FROM          [Transaction] AS Transaction_3
                            WHERE      (Type = 'Debit Settlement') AND (Paid IS NOT NULL))) AS OutstandingDebit
FROM         [Transaction] AS Transaction_1
WHERE     (Type <> 'Debit Settlement') AND (Cashout >= 0) AND (CustomerID = 132)

Answer 1

试试这个。我相信它有效。余额应为-200。 我敢肯定，虽然有人可以编辑它并优化它或使它看起来更优雅！ @Justin，@ Tim Rogers，@ nec tso

 SELECT (
 (SELECT coalesce(SUM(cashout),0)- 
                        ((select coalesce(sum(Buyin),0) from [Transaction] where TYPE='Credit' and CustomerID=132)
                         + (select coalesce(sum(Paid),0) from [Transaction] where TYPE='Credit' and CustomerID=132))


FROM [transaction]
WHERE TYPE='Credit'
AND CustomerID=132
)
-------------------
+
(
(SELECT coalesce(SUM(cashout),0)
                    - (select coalesce(sum(Paid),0) from [Transaction] where TYPE='Debit' AND Cashout>buyin and CustomerID=132) 
                    +  (select coalesce(sum(Cashout),0)- (select coalesce(sum(PAID),0) from [Transaction] where TYPE='Debit' AND Cashout<buyin and CustomerID=132)
                             from [Transaction] where TYPE='Debit' AND Cashout<Buyin and CustomerID=132)
                    +  (select coalesce(sum(Cashout),0)- (select coalesce(sum(PAID),0) from [Transaction] where TYPE='Debit' AND Cashout=buyin and CustomerID=132)
                             from [Transaction] where TYPE='Debit' AND Cashout=Buyin and CustomerID=132)
FROM [Transaction]
WHERE CustomerID=132
AND TYPE='Debit' 
AND Cashout>buyin )
)
--------------
-
(
select coalesce(sum(Paid),0)
from [Transaction] 
where type='Debit Settlement'
AND CustomerID =132
)
--------------
+
(
select coalesce(sum(Paid),0)
from [Transaction] 
where type='Credit Settlement'
AND CustomerID =132
)
);