Запас старения с помощью SQL Server

Question

У меня есть содержимое таблицы, как показано ниже, где «ItemName» - это название товаров, «CurrentStock» - текущее количество товаров на складе, а все остальные столбцы - это сумма запасов в этом году.,Теперь я хочу заменить все отрицательные значения на 0 и скорректировать эти отрицательные значения положительными значениями в порядке FIFO.Может ли кто-нибудь подсказать мне, как это сделать в SQL Server.

Вот ожидаемый результат

Первоначально я пытался так

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

, но это дало неправильный вывод, как это

Спасибо

Answer 1

Для этого может быть два решения.

1. Использование таблицы #Temp, как показано ниже

   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. Используя курсор, вы можете выполнять итерации на основе строк.и написать логику.поскольку в SQL это не рекомендуется, используйте его, только если у вас нет другого параметра.

Answer 2

Как вы думаете, для чего вам нужны суммы в CASE с?Учитывая ваш пример, мне кажется, что один CASE на каждый отдельный столбец дает желаемый эффект.Для расчета Qnty2012andBefore вычтите из CurrentStock еще раз, индивидуально применяя CASE к слагаемым.Вот так:

SELECT ItemName,
       CurrentStock,
       CASE
         WHEN Qnty2018 < 0
           THEN 0
         ELSE
           Qnty2018
       END Qnty2018,
       ...
       CASE
         WHEN Qnty2013 < 0
           THEN 0
         ELSE
           Qnty2013
       END Qnty2013,
       CurrentStock
       -
       CASE
         WHEN Qnty2018 < 0
           THEN 0
         ELSE
           Qnty2018
       END
       ...
       -
       CASE
         WHEN Qnty2013 < 0
           THEN 0
         ELSE
           Qnty2013
       END Qnty2012andBefore
       FROM StockTable;