绑定多个父层次结构

Question

我有一个 table，其中保存了有关某些分支和层次结构的信息。信息未以可用于维度建模的方式存储，因此经过多次转换和提取后，我最终得到：

其中 n0 是第一级，n11 是最高级。问题是层次结构不能像这样遍历：

SELECT 
    distinct 
        nelem.Element n0,
        primul.Element n1,
        doilea.Element n2, 
        treilea.Element n3,
        patrulea.Element n4 

FROM 
    [MIS].[dbo].[BedrockImportBST] nelem
    left join  [BedrockImportBST] primul on primul.Element=nelem.Value1 and primul.LineType in ('e','p')
    left join  [BedrockImportBST] doilea on doilea.Element=primul.Value1 and doilea.LineType in ('e','p')
    left join  [BedrockImportBST] treilea on treilea.Element=doilea.Value1 and treilea.LineType in ('e','p')
    left join  [BedrockImportBST] patrulea on patrulea.Element=treilea.Value1 and patrulea.LineType in ('e','p')

是否可以将父子关系 ID 分配给此解决方案，以便递归遍历？

Answer 1

然后为了将平面数据转换为父子层次结构，您可以使用如下所示的简单联合生成唯一 ID（我使用 FlatHierarchy 作为您的 table 的名称）。我看到一个特定的元素可以出现在多个层次上，并且可以有不同的父元素，这看起来有点奇怪，但就是这样：

DECLARE @IDS TABLE
(
    ID INT IDENTITY (1,1) NOT NULL,
    Label varchar(50)
)
INSERT INTO @IDS (Label)
SELECT n0
FROM FlatHierarchy
UNION 
SELECT n1
FROM FlatHierarchy
UNION 
SELECT n2
FROM FlatHierarchy
UNION 
SELECT n3
FROM FlatHierarchy
UNION 
SELECT n4
FROM FlatHierarchy
UNION 
SELECT n5
FROM FlatHierarchy
.....
UNION 
SELECT n11
FROM FlatHierarchy


SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n0
LEFT JOIN @IDS parent ON f.n1 = parent.Label
UNION 
SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n1
LEFT JOIN @IDS parent ON f.n2 = parent.Label
UNION 
SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n2
LEFT JOIN @IDS parent ON f.n3 = parent.Label
UNION 
SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n3
LEFT JOIN @IDS parent ON f.n4 = parent.Label
UNION 
SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n4
LEFT JOIN @IDS parent ON f.n5 = parent.Label
.....
UNION 
SELECT i.ID, parent.ID ParentID, i.Label
FROM @IDS i
INNER JOIN FlatHierarchy f ON i.Label = f.n10
LEFT JOIN @IDS parent ON f.n11 = parent.Label

绑定多个父层次结构

Binding a mutltiple parent hierarchy

sql-server

parent-child

hierarchy

recursive-query

dimensional