如何處理dateadd中的月份值

Question

我知道問題是什麼，但任何人都可以請建議如何解決此查詢。

的問題是，當我在DATEADD我得到的值計算個月超過98540 :(

declare @Basepool int =10000000 
declare @transactioncount bigint =1 
declare @Monthnum int=1 
declare @ContractId int=1 

select CASE @Basepool 
      WHEN 0 THEN 'N/A' 
      WHEN -1 THEN 'N/A' 
      ELSE CASE 
        WHEN SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId) > @Basepool THEN 'IN-OVERAGE' 
        --WHEN SUM(SUM(B.TransactionCount)) OVER (Partition by @ContractId) + (SUM(SUM(B.TransactionCount)) OVER (Partition by @ContractId)/MonthNum) > U.BasePool THEN DATEADD(MM, 1, GETDATE()) 
        ELSE CONVERT(VARCHAR(20),DATEADD(MM,CAST(ROUND((@Basepool - SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)) 
           /(SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)/@Monthnum),0) as INT), GETDATE()),101) 

        --(basepool - sumcontract)/(sumcontract/monthNum) is the expected months to reach overage 
       END 

      END AS ExpectedDate 

Answer 1

首先，最大的幾個月裏，我可以添加到GETDATE（）是

select dateadd(mm, 95840, getdate()) 

您需要的是一種處理異常情況的方法，其中要添加的月數大於限制。

試試這個：

select DATEADD(MM 
    , case when CAST(ROUND((@Basepool - SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId))/(SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)/@Monthnum),0) as INT) 
     > datediff(mm, getdate(), '9999-12-31') 
     then datediff(mm, getdate(), '9999-12-31') 
     else CAST(ROUND((@Basepool - SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId))/(SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)/@Monthnum),0) as INT) 
     end 
    , GETDATE()) 

您需要獲取值從查詢後回來處理 '9999-12-XX'。

Answer 2

你@Basepool變量有很長的值是INT溢出。 剛剛嘗試以下糾正碼。

declare @Basepool INT =10000 
declare @transactioncount bigint =1 
declare @Monthnum int=1 
declare @ContractId int=1 

select CASE @Basepool 
      WHEN 0 THEN 'N/A' 
      WHEN -1 THEN 'N/A' 
      ELSE CASE 
        WHEN SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId) > @Basepool THEN 'IN-OVERAGE' 
        ELSE CONVERT(VARCHAR(20),DATEADD(MM,CAST(ROUND((@Basepool - SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)) 
           /(SUM(SUM(@TransactionCount)) OVER (Partition by @ContractId)/@Monthnum),0) as INT), GETDATE()),101) 
       END 

     END AS ExpectedDate