Question

我有一个存储过程，从2个不同的服务器上提取数据，如下所示：

SELECT 
        LocalDB.Record_ID,  
        LocalDB.Total/1440 as TotalTime,
        ((REMOTE_ACTIVE.Time_Adjusted) - (REMOTE_ACTIVETimes.CALCTimeSec)) as TimeLeft,
        LocalDB.isManualEntry
        FROM LocalDatabase.dbo.Records LocalDB left join
                   [RemoteServer].[Reporting].[dbo].[ActiveWO] REMOTE_ACTIVE ON
                   LocalDB.WO_ID = REMOTE_ACTIVE.[PO_ID]
                   left join [RemoteServer].[Reporting].[dbo].[ActiveWOTimes] REMOTE_ACTIVETimes ON
            LocalDB.WO_ID = REMOTE_ACTIVETimes.[PO_ID]

可能发生的情况是，有时“TimeLeft”值可能为0.当发生这种情况时，我想用

之类的内容替换该值

IF(TimeLeft is 0 or null)
(getdate() - LocalDB.CreatedDate) as TimeElapsed

问题是，我不确定如何实施这样的IF声明，或者甚至是否可能。

Answer 1

只需添加case声明：

SELECT LocalDB.Record_ID,  
       LocalDB.Total/1440 as TotalTime,
       (case when REMOTE_ACTIVE.Time_Adjusted - REMOTE_ACTIVETimes.CALCTimeSec <> 0
             then REMOTE_ACTIVE.Time_Adjusted - REMOTE_ACTIVETimes.CALCTimeSec
             else getdate() - LocalDB.CreatedDate
        end) as TimeLeft,
       LocalDB.isManualEntry
FROM LocalDatabase.dbo.Records LocalDB left join
     [RemoteServer].[Reporting].[dbo].[ActiveWO] REMOTE_ACTIVE
     ON LocalDB.WO_ID = REMOTE_ACTIVE.[PO_ID] left join
     [RemoteServer].[Reporting].[dbo].[ActiveWOTimes] REMOTE_ACTIVETimes
     ON LocalDB.WO_ID = REMOTE_ACTIVETimes.[PO_ID];

我在问题中假设TimeElapsed替代TimeLeft。

Answer 2

您可以使用子查询

Select RecordID,TotalTime,TimeLeft,IsManualEntry,
       CASE WHEN TimeLeft=0 OR TimeLeft is null THEN DATEDIFF(day, GETDATE(), CreationDate)
            ELSE  CreationDate END AS TimeElapsed,

FROM (
        SELECT  LocalDB.CreatedDate As CreationDate
        LocalDB.Record_ID as RecordID,  
        LocalDB.Total/1440 as TotalTime,
        ((REMOTE_ACTIVE.Time_Adjusted) - (REMOTE_ACTIVETimes.CALCTimeSec)) as TimeLeft,
        LocalDB.isManualEntry as IsManualEntry
        FROM LocalDatabase.dbo.Records LocalDB left join
                   [RemoteServer].[Reporting].[dbo].[ActiveWO] REMOTE_ACTIVE ON
                   LocalDB.WO_ID = REMOTE_ACTIVE.[PO_ID]
                   left join [RemoteServer].[Reporting].[dbo].[ActiveWOTimes]  
                   REMOTE_ACTIVETimes ON
                   LocalDB.WO_ID = REMOTE_ACTIVETimes.[PO_ID]
      ) Z

有关DATEDIFF

的更多信息

存储过程中的sql IF

2 个答案: