使用SQL Server进行库存老化

Question

我有一个表格内容如下，其中'ItemName'是项目的名称，'CurrentStock'是当前库存的物品数量，所有其他列是当年库存和库存的总和。现在我想用0替换所有负值，并用FIFO顺序中的正值调整这些负值。任何人都可以指导我在SQL Server中如何做到这一点。

这是预期结果

最初我试过这个

select ItemName,CurrentStock, 
case when (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013)<0 and (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)>=0 then (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore) 
    when (Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013)<0 and (Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)>=0 THEN (Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)
    when (Qnty2016+Qnty2015+Qnty2014+Qnty2013)<0 and (Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)>=0 THEN (Qnty2016+Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)
    when (Qnty2015+Qnty2014+Qnty2013)<0 and (Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)>=0 THEN (Qnty2015+Qnty2014+Qnty2013+Qnty2012andBefore)
    when (Qnty2014+Qnty2013)<0 and (Qnty2014+Qnty2013+Qnty2012andBefore)>=0 THEN (Qnty2014+Qnty2013+Qnty2012andBefore)
    when Qnty2013 <0 and Qnty2013+Qnty2012andBefore >=0 then Qnty2013+Qnty2012andBefore 
else Qnty2012andBefore end as Qnty2012andBefore,
case when Qnty2013<0 then 0
    when (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014)<0 and (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013)>=0 then (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013) 
    when (Qnty2017+Qnty2016+Qnty2015+Qnty2014)<0 and (Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013)>=0 THEN (Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013)
    when (Qnty2016+Qnty2015+Qnty2014)<0 and (Qnty2016+Qnty2015+Qnty2014+Qnty2013)>=0 THEN (Qnty2016+Qnty2015+Qnty2014+Qnty2013)
    when (Qnty2015+Qnty2014)<0 and (Qnty2015+Qnty2014+Qnty2013)>=0 THEN (Qnty2015+Qnty2014+Qnty2013)
    when (Qnty2014)<0 and (Qnty2014+Qnty2013)>=0 THEN (Qnty2014+Qnty2013)
else Qnty2013 end as Qnty2013,
case when Qnty2014<0 then 0
    when (Qnty2018+Qnty2017+Qnty2016+Qnty2015)<0 and (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014)>=0 then (Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014) 
    when (Qnty2017+Qnty2016+Qnty2015)<0 and (Qnty2017+Qnty2016+Qnty2015+Qnty2014)>=0 THEN (Qnty2017+Qnty2016+Qnty2015+Qnty2014)
    when (Qnty2016+Qnty2015)<0 and (Qnty2016+Qnty2015+Qnty2014)>=0 THEN (Qnty2016+Qnty2015+Qnty2014)
    when (Qnty2015)<0 and (Qnty2015+Qnty2014)>=0 THEN (Qnty2015+Qnty2014)
else Qnty2014 end as Qnty2014,
case when Qnty2015<0 then 0
    when (Qnty2018+Qnty2017+Qnty2016)<0 and (Qnty2018+Qnty2017+Qnty2016+Qnty2015)>=0 then (Qnty2018+Qnty2017+Qnty2016+Qnty2015) 
    when (Qnty2017+Qnty2016)<0 and (Qnty2017+Qnty2016+Qnty2015)>=0 THEN (Qnty2017+Qnty2016+Qnty2015)
    when (Qnty2016)<0 and (Qnty2016+Qnty2015)>=0 THEN (Qnty2016+Qnty2015)
else Qnty2015 end as Qnty2015,
    case when Qnty2016<0 then 0
    when (Qnty2018+Qnty2017)<0 and (Qnty2018+Qnty2017+Qnty2016)>=0 then (Qnty2018+Qnty2017+Qnty2016) 
    when (Qnty2017)<0 and (Qnty2017+Qnty2016)>=0 THEN ( Qnty2017+Qnty2016)
else Qnty2016 end as Qnty2016,
case when Qnty2017<0 then 0
    when (Qnty2018)< 0 and (Qnty2018+Qnty2017)>=0 then (Qnty2018+Qnty2017) 
else Qnty2017 end as Qnty2017,
case when Qnty2018<0 then 0 else Qnty2018 end as Qnty2018 FROM StockTable

但它给出了错误的输出

谢谢

Answer 1

可能有两种解决方案。

1. 使用#Temp表如下所示

   SELECT ItemName,CurrentStock,
   CASE when Qnty2018<0 THEN 0 ELSE Qnty2018 END as Qnty2018,
   CASE when Qnty2017<0 THEN 0 ELSE Qnty2017 END as Qnty2017,
   CASE when Qnty2016<0 THEN 0 ELSE Qnty2016 END as Qnty2016,
   CASE when Qnty2015<0 THEN 0 ELSE Qnty2015 END as Qnty2015,
   CASE when Qnty2014<0 THEN 0 ELSE Qnty2014 END as Qnty2014,
   CASE when Qnty2013<0 THEN 0 ELSE Qnty2013 END as Qnty2013,
   CASE when Qnty2012andBefore<0 THEN 0 ELSE Qnty2012andBefore END as Qnty2012andBefore INTO #Temp FROM StockTable
   
   update #Temp set Qnty2018=CurrentStock WHERE Qnty2018<>0 AND Qnty2017=0 AND Qnty2016=0 AND Qnty2015=0 AND Qnty2014=0 AND Qnty2013=0 AND Qnty2012andBefore=0
   update #Temp set Qnty2017=CurrentStock-Qnty2018 WHERE Qnty2017<>0 AND Qnty2016=0 AND Qnty2015=0 AND Qnty2014=0 AND Qnty2013=0 AND Qnty2012andBefore=0
   update #Temp set Qnty2016=CurrentStock-Qnty2018+Qnty2017 WHERE Qnty2016<>0 AND Qnty2015=0 AND Qnty2014=0 AND Qnty2013=0 AND Qnty2012andBefore=0
   update #Temp set Qnty2015=CurrentStock-Qnty2018+Qnty2017+Qnty2016 WHERE Qnty2015<>0 AND Qnty2014=0 AND Qnty2013=0 AND Qnty2012andBefore=0
   update #Temp set Qnty2014=CurrentStock-Qnty2018+Qnty2017+Qnty2016+Qnty2015 WHERE Qnty2014<>0 AND Qnty2013=0 AND Qnty2012andBefore=0
   update #Temp set Qnty2013=CurrentStock-Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014 WHERE Qnty2013<>0 AND Qnty2012andBefore=0
   update #Temp set Qnty2012andBefore=CurrentStock-Qnty2018+Qnty2017+Qnty2016+Qnty2015+Qnty2014+Qnty2013 WHERE Qnty2012andBefore<>0
   SELECT * FROM #Temp
   

   2.使用Cursor，您可以基于行迭代并编写逻辑。因为在SQL中不建议这样做，所以只有在没有其他选项时才使用它。