SP執行錯誤

Question

我寫下面SP.But當我嘗試運行此查詢我收到此錯誤：

There is already an object named '#myCourses1' in the database.

兩個其他迴路所以這讓。也

create proc [dbo].[GetOrdersByUserIDwithSubscription]  
( 
    @UserID int  
)  
as  
begin  

    declare @status varchar(500) 

    declare @substatus char(2) 

    select @substatus=Subscribe_status from tbl_user where userid=@userid 

    print @substatus 

    if @substatus='N' 

    BEGIN  
     select a.*, b.CategoryText, Cast('' as Varchar(10)) as SectionsViewed, PurchasedDate as dateadded into #myCourses1 from dbo.Tbl_CourseInformations a JOIN Tbl_Categories b ON a.AssignCategory = b.CategoryID  
     Join Tbl_Orders c ON c.UserID = @UserID and c.CourseID = a.CourseID and c.courseprice<>'subscriber' 
     Order By CategoryText, CourseTitle   
    END 

    else if @substatus='' 

    BEGIN  
     select a.*, b.CategoryText, Cast('' as Varchar(10)) as SectionsViewed, PurchasedDate as dateadded into #myCourses1 from dbo.Tbl_CourseInformations a JOIN Tbl_Categories b ON a.AssignCategory = b.CategoryID  
     Join Tbl_Orders c ON c.UserID = @UserID and c.CourseID = a.CourseID and c.courseprice<>'subscriber' 
     Order By CategoryText, CourseTitle  
    END 

    else if @substatus='Y'  
    BEGIN  
     select a.*, b.CategoryText, Cast('' as Varchar(10)) as SectionsViewed, PurchasedDate as dateadded into #myCourses1 from dbo.Tbl_CourseInformations a JOIN Tbl_Categories b ON a.AssignCategory = b.CategoryID  
     Join Tbl_Orders c ON c.UserID = @UserID and c.CourseID = a.CourseID  
     Order By CategoryText, CourseTitle 
    END 

Answer 1

在proc的開頭顯式創建臨時表。

CREATE TABLE #myCourses1 (
    ... 
) 

然後再編寫SELECT語句：

INSERT INTO #myCourses1 
    select a.*, b.CategoryText, Cast('' as Varchar(10)) as SectionsViewed, PurchasedDate as dateadded 
     from dbo.Tbl_CourseInformations 
     ... 

Answer 2

此外，你有一個查詢的monstrocity可以減少到這樣的：

create proc [dbo].[GetOrdersByUserIDwithSubscription]( 
    @UserID int  
)  
as  
begin 
    declare @substatus char(2) 

    select @substatus = Subscribe_status 
    from tbl_user 
    where userid = @userid 

    select a.*, b.CategoryText, 
     Cast("" as Varchar(10)) as SectionsViewed, 
     PurchasedDate as dateadded 
    from dbo.Tbl_CourseInformations a 
     join Tbl_Categories b ON a.AssignCategory = b.CategoryID 
     join Tbl_Orders c ON c.UserID = @UserID 
      and c.CourseID = a.CourseID 
      and (@substatus = 'N' or c.courseprice <> 'subscriber') 
    order by CategoryText, CourseTitle   

END 

Answer 3

SQL解釋是窒息，因爲你已經在IF的不同部分使用了相同的臨時表名聲明。 IF沒有其他編程語言的範圍。

如果您不需要在每個IF塊之外引用臨時表，則可以通過在每個零件中使用不同的表名來解決該問題。

看一看my answer to a similar question。

Answer 4

你的語法是

SELECT [Column-List] INTO #TempTable FROM [Rest-of-Query] 

當使用這種語法，SQL Server試圖在基於您的列清單（source）動態創建#TempTable。

爲了解決這個問題，在存儲過程開始時（如果不需要超出SP範圍的數據），或者使其成爲永久表，則可以使用Drop #TempTable。