我有以下CTE使用递归来获取Hierarhcy中的每个节点的级别，最后，因为我有27个级别，所以我抓住每个级别的名称，因为最终用户不想看到的GUID。
with EmpTree
as
(
select e.DWH_Dim_TFS_File_DWH_File_Guid, cast(cast(e.DWH_Dim_TFS_File_DWH_File_Guid as binary(4)) as varbinary(max)) as EmpHier,
1 as EmployeeLevel
from [DWH].[Dim_TFS_File_View] as e
where e.DWH_Dim_TFS_File_DWH_FileParent_Guid is null
union all
select c.DWH_Dim_TFS_File_DWH_File_Guid, cast(p.EmpHier + cast(c.DWH_Dim_TFS_File_DWH_File_Guid as binary(4)) as varbinary(max)),
EmployeeLevel +1 as EmployeeLevel
from EmpTree as p
join [DWH].[Dim_TFS_File_View] as c
on c.DWH_Dim_TFS_File_DWH_FileParent_Guid = p.DWH_Dim_TFS_File_DWH_File_Guid
)
select TOP 100 PERCENT DWH_Dim_TFS_File_DWH_File_Guid
,EmployeeLevel
,(SELECT [File_Name] from [DWH].[Dim_TFS_File_View] as pu where nullif(cast(substring(EmpHier, 1, 4) as int), 0) = pu.DWH_Dim_TFS_File_DWH_File_Guid) level1
,(SELECT [File_Name] from [DWH].[Dim_TFS_File_View] as pu where nullif(cast(substring(EmpHier, 1, 9) as int), 0) = pu.DWH_Dim_TFS_File_DWH_File_Guid) level2
,(SELECT [File_Name] from [DWH].[Dim_TFS_File_View] as pu where nullif(cast(substring(EmpHier, 1, 13) as int), 0) = pu.DWH_Dim_TFS_File_DWH_File_Guid) level3
from EmpTree
order by DWH_Dim_TFS_File_DWH_File_Guid
我有27个等级...... 我抓取信息的视图有三个索引： （父母，子女） （父） （儿童）
这个表有200M行并且还在增长..所以这个查询非常慢，我想大部分也会导致每个级别的所有“名字抓取”......
这是一种更有效的方式来实现我的结果吗？也许通过一些加入？
如果可以，请帮忙
谢谢！
没有获得正确的递归，只获取Anchor部分。
with EmpTree
as
(
select e.DWH_Dim_TFS_File_DWH_FileParent_Guid,e.DWH_Dim_TFS_File_DWH_File_Guid,
1 as Depth,
File_Name_String = CAST(CAST(e.File_Name AS BINARY(100)) AS VARBINARY(8000))
from [dbo].[Hierarchy_Luis] as e
where e.DWH_Dim_TFS_File_DWH_FileParent_Guid is null
union all
select e.DWH_Dim_TFS_File_DWH_FileParent_Guid,e.DWH_Dim_TFS_File_DWH_File_Guid,
p.Depth +1 as Depth,
File_Name_String = CAST(CONCAT(p.File_Name_String, CAST(e.File_Name AS BINARY(100))) AS VARBINARY(8000))
from [dbo].[Hierarchy_Luis] as e
join EmpTree as p
on e.DWH_Dim_TFS_File_DWH_FileParent_Guid = p.DWH_Dim_TFS_File_DWH_File_Guid
)
SELECT
p.DWH_Dim_TFS_File_DWH_File_Guid,
p.Depth,
Level01 =CAST(SUBSTRING(p.File_Name_String, 1, 100) as nvarchar(100)),
Level02 =CAST(SUBSTRING(p.File_Name_String, 101, 100) as nvarchar(100)),
Level03 =CAST(SUBSTRING(p.File_Name_String, 201, 100) as nvarchar(100)),
Level04 =CAST(SUBSTRING(p.File_Name_String, 301, 100) as nvarchar(100)),
Level05 =CAST(SUBSTRING(p.File_Name_String, 401, 100) as nvarchar(100)),
Level07 =CAST(SUBSTRING(p.File_Name_String, 501, 100) as nvarchar(100)),
Level08 =CAST(SUBSTRING(p.File_Name_String, 601, 100) as nvarchar(100)),
Level09 =CAST(SUBSTRING(p.File_Name_String, 701, 100) as nvarchar(100)),
Level10 =CAST(SUBSTRING(p.File_Name_String, 801, 100) as nvarchar(100)),
Level11 =CAST(SUBSTRING(p.File_Name_String, 901, 100) as nvarchar(100)),
Level12 =CAST(SUBSTRING(p.File_Name_String, 1001, 100) as nvarchar(100)),
Level13 =CAST(SUBSTRING(p.File_Name_String, 1101, 100) as nvarchar(100)),
Level14 =CAST(SUBSTRING(p.File_Name_String, 1201, 100) as nvarchar(100)),
Level15 =CAST(SUBSTRING(p.File_Name_String, 1301, 100) as nvarchar(100)),
Level16 =CAST(SUBSTRING(p.File_Name_String, 1401, 100) as nvarchar(100)),
Level17 =CAST(SUBSTRING(p.File_Name_String, 1501, 100) as nvarchar(100)),
Level18 =CAST(SUBSTRING(p.File_Name_String, 1601, 100) as nvarchar(100)),
Level19 =CAST(SUBSTRING(p.File_Name_String, 1701, 100) as nvarchar(100)),
Level20 =CAST(SUBSTRING(p.File_Name_String, 1801, 100) as nvarchar(100)),
Level21 =CAST(SUBSTRING(p.File_Name_String, 1901, 100) as nvarchar(100)),
Level22 =CAST(SUBSTRING(p.File_Name_String, 2001, 100) as nvarchar(100)),
Level23 =CAST(SUBSTRING(p.File_Name_String, 2101, 100) as nvarchar(100)),
Level24 =CAST(SUBSTRING(p.File_Name_String, 2201, 100) as nvarchar(100)),
Level25 =CAST(SUBSTRING(p.File_Name_String, 2301, 100) as nvarchar(100)),
Level26 =CAST(SUBSTRING(p.File_Name_String, 2401, 100) as nvarchar(100)),
Level27 =CAST(SUBSTRING(p.File_Name_String, 2501, 100) as nvarchar(100))
FROM EmpTree p
答案 0 :(得分：1)
如果没有具有代表性的测试数据和预期结果，很难确定细节......以下内容应该在球部分......
IF OBJECT_ID('tempdb..#Dim_TFS_File_View', 'U') IS NOT NULL
DROP TABLE #Dim_TFS_File_View;
GO
CREATE TABLE #Dim_TFS_File_View (
DWH_Dim_TFS_File_DWH_File_Guid INT NOT NULL,
DWH_Dim_TFS_File_DWH_FileParent_Guid INT NULL,
[File_Name] UNIQUEIDENTIFIER NOT NULL
);
INSERT #Dim_TFS_File_View (DWH_Dim_TFS_File_DWH_File_Guid, DWH_Dim_TFS_File_DWH_FileParent_Guid, [File_Name])
SELECT
DWH_Dim_TFS_File_DWH_File_Guid = t.n,
DWH_Dim_TFS_File_DWH_FileParent_Guid = CASE WHEN t.n = 1 THEN NULL ELSE ISNULL(NULLIF(mi.ManagerID -1, 0), 1) END,
[File_Name] = NEWID()
FROM
dbo.tfn_Tally(1000, 1) t
CROSS APPLY ( VALUES (ABS(CHECKSUM(NEWID())) % t.n + 1) ) mi (ManagerID);
-- SELECT * FROM #Dim_TFS_File_View dtfv;
WITH
cte_Recursion AS (
SELECT
e.DWH_Dim_TFS_File_DWH_File_Guid,
NodeLevel = 1,
File_Name_String = CAST(CAST(e.[File_Name] AS BINARY(16)) AS VARBINARY(8000))
FROM
#Dim_TFS_File_View e
WHERE
e.DWH_Dim_TFS_File_DWH_FileParent_Guid IS NULL
UNION ALL
SELECT
e.DWH_Dim_TFS_File_DWH_File_Guid,
NodeLevel = r.NodeLevel + 1,
File_Name_String = CAST(CONCAT(r.File_Name_String, CAST(e.[File_Name] AS BINARY(16))) AS VARBINARY(8000))
FROM
cte_Recursion r
JOIN #Dim_TFS_File_View e
ON r.DWH_Dim_TFS_File_DWH_File_Guid = e.DWH_Dim_TFS_File_DWH_FileParent_Guid
)
SELECT
r.DWH_Dim_TFS_File_DWH_File_Guid,
r.NodeLevel,
Level01 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 1, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level02 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 17, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level03 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 33, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level04 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 49, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level05 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 65, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level06 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 81, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level07 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 97, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level08 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 113, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level09 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 129, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level10 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 145, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level11 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 161, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level12 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 177, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level13 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 193, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level14 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 209, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level15 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 225, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level16 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 241, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level17 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 257, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level18 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 273, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level19 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 289, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level20 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 305, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level21 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 321, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level22 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 337, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level23 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 353, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level24 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 369, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level25 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 385, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level26 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 401, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000'),
Level27 = NULLIF(CAST(SUBSTRING(r.File_Name_String, 417, 16) AS UNIQUEIDENTIFIER), '00000000-0000-0000-0000-000000000000')
FROM
cte_Recursion r;
输出样本......
DWH_Dim_TFS_File_DWH_File_Guid NodeLevel Level01 Level02 Level03 Level04 Level05 Level06 Level07 Level08 Level09 Level10 Level11 Level12 Level13 Level14 Level15 Level16 Level17 Level18 Level19 Level20 Level21 Level22 Level23 Level24 Level25 Level26 Level27
------------------------------ ----------- ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------ ------------------------------------
1 1 F7CCFA67-F558-41EE-B1BF-8D96692AB99F NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL
2 2 F7CCFA67-F558-41EE-B1BF-8D96692AB99F 34CAF6D3-44BA-4DE1-9E03-836EE38C43E3 NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL
3 2 F7CCFA67-F558-41EE-B1BF-8D96692AB99F A69D9BE6-D83A-40AB-9D5B-04219317A3F9 NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL