SQL Server臨時表已存在？

Question

所以這很奇怪，我在這個SQL位中聲明瞭一個臨時表，但是我只是基於if else邏輯聲明它。在運行下面的查詢之前，我正在刪除臨時表，並且仍然得到相同的行爲。

但是，SQL Server與There is already an object named '#ManifestTrackingBranches' in the database. complaing，當我試圖用我的ReportType集運行查詢到2

我在這裏失去了一些東西？如果其中ReportType被設置爲2，並且我試圖選擇到同一個臨時表的第二發生

T-SQL

declare @ReportType int 
declare @CustomerNumber int 
declare @StartDate datetime 
declare @EndDate datetime 

set @ReportType = 2 
set @CustomerNumber = 81 
set @StartDate = '2014-04-27' 
set @EndDate = '2014-05-04' 

if @CustomerNumber = 81 
begin 
    if @ReportType = 1 -- roll up by location 
    begin 
     select InboundData.Tracking, 
       InboundData.NegotiatedRate 
     into #ManifestTrackingBranches 
     from InboundData 
     where Injected >= @StartDate and Injected <= @EndDate 

     -- Match tracking numbers against Ebill Data 
     select  #ManifestTrackingBranches.Tracking, 
        SUM(isnull(cast(#ManifestTrackingBranches.NegotiatedRate as decimal(18,2)),0)) as ManifestAmount 
     from  EBillData 
     group by #ManifestTrackingBranches.Branch 
    end 

    else if @ReportType = 2 -- Line Item Reports 
    begin 
     select InboundData.Tracking, 
       InboundData.NegotiatedRate 
     into #ManifestTrackingBranches 
     from InboundData 
     where Injected >= @StartDate and Injected <= @EndDate 

     -- Match tracking numbers against Ebill Data 
     select  #ManifestTrackingBranches.Tracking, 
        SUM(isnull(cast(#ManifestTrackingBranches.NegotiatedRate as decimal(18,2)),0)) as ManifestAmount 
     from  EBillData 
    end 
end 

該錯誤。

Answer 1

在任何變量聲明之前添加這行代碼。

IF OBJECT_ID('tempdb..#ManifestTrackingBranches') IS NOT NULL 
DROP TABLE #ManifestTrackingBranches 
GO 

將只具有影響，如果這種說法是在一個單獨的批次，使用GO關鍵詞。當你實際編寫你的過程並再次執行它再測試代碼時足夠好。

在您的過程中，您無法添加關鍵字GO，並且在從應用程序調用此過程時，不需要刪除表。對此過程的每次調用都將擁有自己的連接，並將創建一個僅限於該連接範圍的臨時表。

Answer 2

SQL將保留每個連接的臨時表，除非您放棄它們。因此，一旦完成使用，放棄臨時表是一個不錯的主意。

添加DROP TABLE語句

declare @ReportType int 
declare @CustomerNumber int 
declare @StartDate datetime 
declare @EndDate datetime 

set @ReportType = 2 
set @CustomerNumber = 81 
set @StartDate = '2014-04-27' 
set @EndDate = '2014-05-04' 

if @CustomerNumber = 81 
begin 
    if @ReportType = 1 -- roll up by location 
    begin 
    select InboundData.Tracking, 
      InboundData.NegotiatedRate 
    into #ManifestTrackingBranches 
    from InboundData 
    where Injected >= @StartDate and Injected <= @EndDate 

    -- Match tracking numbers against Ebill Data 
    select  #ManifestTrackingBranches.Tracking, 
       SUM(isnull(cast(#ManifestTrackingBranches.NegotiatedRate as decimal(18,2)),0)) as ManifestAmount 
    from  EBillData 
    group by #ManifestTrackingBranches.Branch; 

    --clean up after yourself 
    drop table #ManifestTrackingBranches 
    end 

    else if @ReportType = 2 -- Line Item Reports 
    begin 
    select InboundData.Tracking, 
      InboundData.NegotiatedRate 
    into #ManifestTrackingBranches 
    from InboundData 
    where Injected >= @StartDate and Injected <= @EndDate 

    -- Match tracking numbers against Ebill Data 
    select  #ManifestTrackingBranches.Tracking, 
       SUM(isnull(cast(#ManifestTrackingBranches.NegotiatedRate as decimal(18,2)),0)) as ManifestAmount 
    from  EBillData 

    --clean up after yourself 
    drop table #ManifestTrackingBranches 
    end 
end