SP帮助（无效的列名称）

Question

使用MS SQL存储过程我收到以下错误“无效的列名NavigationID”。

任何人都可以让我知道我做错了吗？

DECLARE @NavigationID INT 
SET @NavigationID = 5 

CREATE TABLE #tmp (NavigationID int , ParentID int); 
INSERT INTO #tmp SELECT NavigationID, ParentID FROM Nav; 

    WITH Parent AS 
    (
     SELECT NavigationID, ParentID FROM #tmp WHERE NavigationID = @NavigationID 
     UNION ALL 
     SELECT t.NavigationID, t.ParentID FROM Parent 
     INNER JOIN #tmp t ON t.NavigationID = Parent.ParentID 
    ) 

    SELECT NavigationID FROM ParentID 
    WHERE NavigationID <> @NavigationID; 

Answer 1

随着你发布的代码，你会得到。

Msg 208, Level 16, State 1, Line 10 
Invalid object name 'ParentID'. 

更改FROM ParentID至。

您还需要表Nav中的栏NavigationID。

试试这个：

declare @Nav table(NavigationID int, ParentID int) 

insert into @Nav 
select 1, null union all 
select 2, 1 union all 
select 3, 1 union all 
select 4, 3 union all 
select 5, 3 union all 
select 6, null union all 
select 7, 6 

declare @NavigationID int; 
set @NavigationID = 5; 


with Parent as 
(
    select NavigationID, 
     ParentID 
    from @Nav 
    where NavigationID = @NavigationID 
    union all 
    select t.NavigationID, t.ParentID 
    from Parent 
    inner join @Nav t 
     on t.NavigationID = Parent.ParentID 
) 
select NavigationID 
from Parent 
where NavigationID <> @NavigationID; 

结果：

NavigationID 
------------ 
3 
1 

更换@Nav与任何表所使用。 @Nav只是在这里，以便这个代码可以复制和测试。