Cumulative Related Records From Hierarchy

Oh hai

This is closely related to this problem where Ryan & Peter helped me out loads (thanks again guys):
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=101989

I now have a slightly different problem. Instead of returning the cumulative counts of people related to a business unit in the hierarchy I now need to return the actual people records. I had some code, derived from the above, that worked fine until I loaded some new data. It took a while but eventually I figured out the (now obvious) reason for the error. I have tried several changes to the query and not got anywhere. Please could someone have a look and see if you can suggest the required alteration(s)?

USE tempdb
go

---------------------------------------------------------------
--Set up the structure & data...
---------------------------------------------------------------
CREATE TABLE dbo.org
(
unit_codeVARCHAR(10)NOT NULL
, parent_codeVARCHAR(10)NULL
, CONSTRAINT pk_orgPRIMARY KEY CLUSTERED (unit_code) WITH (FILLFACTOR = 100)
)
GO

CREATE TABLE dbo.org_peeps
(
unit_codeVARCHAR(10)NOT NULL
, person_codeINTNOT NULL
, CONSTRAINT pk_org_peepsPRIMARY KEY CLUSTERED (unit_code, person_code) WITH (FILLFACTOR = 100)
, CONSTRAINT fk_org_peeps_other_org_peepsFOREIGN KEY (unit_code) REFERENCES dbo.org (unit_code)
)
GO

CREATE VIEW dbo.org_peeps_parents
--WITH SCHEMABINDING
AS
SELECT org.unit_code
, org.parent_code
, org_peeps.person_code
FROMdbo.org
LEFT OUTER JOIN
dbo.org_peeps
ONorg_peeps.unit_code= org.unit_code
GO

INSERT INTO dbo.org (unit_code, parent_code)
SELECT 'a', 'y'UNION ALL
SELECT 'b', 'y'UNION ALL
SELECT 'c', 'z'UNION ALL
SELECT 'y', 'z'UNION ALL
SELECT 'z', NULL

--Insert people data (NOTE - the people are in units at the BOTTOM of the structure only)
INSERT INTO dbo.org_peeps (unit_code, person_code)
SELECT 'a', 1UNION ALL
SELECT 'c', 3

---------------------------------------------------------------
SELECT'This works great....'
---------------------------------------------------------------
;WITHmaterialised_paths
AS
(
SELECTunit_code
, parent_code
, person_code
, unit_path= '/' + CAST(unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents
WHEREparent_code IS NULL
UNION ALL
SELECTall_people.unit_code
, all_people.parent_code
, all_people.person_code
, mp.unit_path + CAST(all_people.unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents AS all_people
INNER JOIN
materialised_paths AS mp
ONmp.unit_code= all_people.parent_code
)

SELECTparents.unit_code
, children.person_code
, children.unit_path
FROMmaterialised_paths AS children
CROSS APPLY--Correlated derived table - get the child records per unit
(
SELECTunit_code
, parent_code
FROMdbo.orgAS parents_sub
WHEREchildren.unit_path LIKE '%/' + parents_sub.unit_code + '/%'
) AS parents
WHEREchildren.person_code IS NOT NULL
ORDER BY person_code
, unit_code


--Add data to INTERMEDIATE levels of organisation
INSERT INTO dbo.org_peeps (unit_code, person_code)
SELECT 'y', 4UNION ALL
SELECT 'y', 5UNION ALL
SELECT 'y', 6

---------------------------------------------------------------
SELECT'Since there is now data in the intermediate tables there are ' +
'duplicate outputs....'
---------------------------------------------------------------
;WITHmaterialised_paths
AS
(
SELECTunit_code
, parent_code
, person_code
, unit_path= '/' + CAST(unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents
WHEREparent_code IS NULL
UNION ALL
SELECTall_people.unit_code
, all_people.parent_code
, all_people.person_code
, mp.unit_path + CAST(all_people.unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents AS all_people
INNER JOIN
materialised_paths AS mp
ONmp.unit_code= all_people.parent_code
)
SELECTparents.unit_code
, children.person_code
, children.unit_path
FROMmaterialised_paths AS children
CROSS APPLY--Correlated derived table - get the child records per unit
(
SELECTunit_code
, parent_code
FROMdbo.orgAS parents_sub
WHEREchildren.unit_path LIKE '%/' + parents_sub.unit_code + '/%'
) AS parents
WHEREchildren.person_code IS NOT NULL
ORDER BY person_code
, unit_code

---------------------------------------------------------------
SELECT'This is the output I want - but I can''t simply apply distinct - the volumes of data preclude this'
---------------------------------------------------------------
;WITHmaterialised_paths
AS
(
SELECTunit_code
, parent_code
, person_code
, unit_path= '/' + CAST(unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents
WHEREparent_code IS NULL
UNION ALL
SELECTall_people.unit_code
, all_people.parent_code
, all_people.person_code
, mp.unit_path + CAST(all_people.unit_code AS VARCHAR(MAX)) + '/'
FROMdbo.org_peeps_parents AS all_people
INNER JOIN
materialised_paths AS mp
ONmp.unit_code= all_people.parent_code
)
SELECTDISTINCT
parents.unit_code
, children.person_code
, children.unit_path
FROMmaterialised_paths AS children
CROSS APPLY--Correlated derived table - get the child records per unit
(
SELECTunit_code
, parent_code
FROMdbo.orgAS parents_sub
WHEREchildren.unit_path LIKE '%/' + parents_sub.unit_code + '/%'
) AS parents
WHEREchildren.person_code IS NOT NULL
ORDER BY person_code
, unit_code


--Clean up
IF EXISTS (SELECT NULL FROM sys.views WHERE object_id = OBJECT_ID('dbo.org_peeps_parents')) BEGIN
DROP VIEW dbo.org_peeps_parents
END

IF EXISTS (SELECT NULL FROM sys.tables WHERE object_id = OBJECT_ID('dbo.org_peeps')) BEGIN
DROP TABLE dbo.org_peeps
END
IF EXISTS (SELECT NULL FROM sys.tables WHERE object_id = OBJECT_ID('dbo.org')) BEGIN
DROP TABLE dbo.org
ENDJust paste and run the code and hopefully it should be reasonably clear. If you need any further info please let me know