我在工作中遇到了一个问题，我已经没有想法了。我不写PL / SQL，但我对学校课程有点熟悉。
这是我的表结构：
CREATE TABLE [dbo].[HateThis](
[CustID] [int] NOT NULL PRIMARY KEY CLUSTERED,
[Company_Name] [nvarchar](50) NOT NULL,
[Total_Balance_Available_For_Allocation] [INT] NOT NULL,
[TotBAL] [INT] NOT NULL,
[Due_0] [INT] NOT NULL,
[Due_1_10] [INT] NOT NULL,
[Due_11_30] [INT] NOT NULL,
[Due_31_60] [INT] NOT NULL,
[Due_61_90] [INT] NOT NULL,
[Due_91_120] [INT] NOT NULL,
[Due_121_150] [INT] NOT NULL,
[Due_151_180] [INT] NOT NULL,
[Due_180+] [INT] NOT NULL,)
INSERT INTO HateThis VALUES (6106,'Google','1000','500','150','100','50','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (6107,'Google','1000','500','150','150','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (510,'Yahoo','500','10','10','0','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (511,'Yahoo','500','0','0','0','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (512,'Yahoo','500','40','5','15','15','4','1','0','0','0','0');
INSERT INTO HateThis VALUES (513,'Yahoo','500','500','500','0','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (514,'Yahoo','500','1200','1000','200','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (106,'Alta Vista','0','50','1','1','1','1','1','1','1','1','42');
INSERT INTO HateThis VALUES (107,'Alta Vista','0','0','0','0','0','0','0','0','0','0','0');
INSERT INTO HateThis VALUES (109,'Alta Vista','0','11','11','0','0','0','0','0','0','0','0');
列信息：
我要编写一个查询，以便将 Total_Balance_Available_For_Allocation 的余额分配给具有最早到期余额的帐户（如果有任何到期余额，则首先查看 Due_180 + 并且它小于可用的金额，然后该金额在此列下分配，如果余额为零，则会查看 Due_151-180 并一直持续到 Due_0 。
如果 Total_Balance_Available_For_Allocation 中仍有剩余资金，请查看同一公司的下一个帐户，看看是否可以将其分配到该帐户中的任何列。
这个问题很难解释。如果我能更好地解释，请告诉我。
这是我到目前为止所做的：
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = a2_currbal then 'post into a2_currnal'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D0_10 then 'post into D0_10'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D11_30 then 'post into D11_30'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D31_60 then 'post into D31_60'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D61_90 then 'post into D61_90'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D91_120 then 'post into D91_120'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D121_150 then 'post into D121_150'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D151_180 then 'post into D151_180'
when total_balance_to_allocate > abs(total_balance_available) and totbal <= abs(total_balance_available) and totbal = D180PLUS then 'post into D180PLUS'
所需的输出如下：
CustID，Company_Name，Do_This
6106，谷歌，邮政300到期到期
6107，谷歌，发布200到期余额
106，Alta Vista，资金不足 108，Alta Vista，资金不足512，雅虎，邮政40到达到期余额
514，Yahoo，Post 460
510，雅虎，资金不足 513，雅虎，资金不足答案 0 :(得分：0)
您的示例输出与实际表格不符。查看您的帖子，您可以在“do_this”列中确定规则，但没有解释您如何确定这些值。以及确定分配最旧余额的解释。
我认为你有更多的规则可以添加，但我希望这可以帮助你指出正确的方向。
Select
a.[CustID]`enter code here`
,a.[Company_Name]
,a.[Total_Balance_Available_For_Allocation]
,a.[TotBAL]
,b.TotalDue
,case when a.Total_balance_available_for_allocation >b.TotalDue Then
a.Total_balance_available_for_allocation-b.TotalDue
else ''
End AllocationAmountBalance
,case when a.Total_balance_available_for_allocation < b.TotalDue then
'Insufficient Money'
else ' '
end BalStatus
from .[dbo].[HateThis] a
JOIN (select ([Due_0]+[Due_1_10]+[Due_11_30]+[Due_31_60]+[Due_61_90]+
[Due_91_120]+[Due_121_150]+[Due_151_180]+[Due_180+]) as TotalDue
,[CustID]
From [dbo].[HateThis] ) b on a.custid = b.custid
order by a.[Company_Name], a.custid`enter code here`