CTE Recursive

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CTE Recursive

hoseam

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Points: 5533
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November 12, 2013 at 3:57 am

#282443

I have this data and CTE recursion below. When I try to run it I get only one row back, not all the rows I'm expecting. please help.
WITH LOCATIONHIERARCHY(LocationID, Parent_location, Location_name, [Level])
AS (
-- Anchor member definition
SELECT LocationID, Parent_location, Location_name, 0 AS [Level]
FROM Location
WHERE Parent_location IS NULL
UNION ALL
-- Recursive member definition
SELECT loc.LocationID, loc.Parent_location, loc.Location_name, [Level] + 1
FROM Location loc
INNER JOIN LOCATIONHIERARCHY loh
ON loc.LocationID = loh.LocationID
WHERE loc.Parent_location IS NOT NULL
)
SELECT *
FROM LOCATIONHIERARCHY
insert into Location (LocationID, Parent_Location, Location_Name)
values(1000, null,'South Africa')
insert into location (LocationID, Parent_Location, Location_Name)
values(1001, 1000, 'Gauteng')
insert into location (LocationID, Parent_Location, Location_Name)
values(1002, 1000, 'Eastern Cape')
insert into location (LocationID, Parent_Location, Location_Name)
values(1003, 1000, 'Western Cape')
insert into location (LocationID, Parent_Location, Location_Name)
values(1004, 1000, 'Free State')
insert into location (LocationID, Parent_Location, Location_Name)
values(1005, 1000, 'North West')
insert into location (LocationID, Parent_Location, Location_Name)
values(1006, 1000, 'Northern Cape')
insert into location (LocationID, Parent_Location, Location_Name)
values(1007, 1000, 'Limpopo')
insert into location (LocationID, Parent_Location, Location_Name)
values(1008, 1000, 'Mpumalanga')
insert into location (LocationID, Parent_Location, Location_Name)
values(1009, 1000, 'KZN')
insert into location (LocationID, Parent_Location, Location_Name)
values(1011, 1001, 'Johannesburg')
insert into location (LocationID, Parent_Location, Location_Name)
values(1012, 1001, 'Pretoria')
insert into location (LocationID, Parent_Location, Location_Name)
values(1013, 1002, 'East London')
insert into location (LocationID, Parent_Location, Location_Name)
values(1014, 1003, 'Cape Town')
insert into location (LocationID, Parent_Location, Location_Name)
values(1015, 1005, 'Rustenburg')
insert into location (LocationID, Parent_Location, Location_Name)
values(1016, 1007, 'Polokwane')
insert into location (LocationID, Parent_Location, Location_Name)
values(1017, 1006, 'Kimberly')
insert into location (LocationID, Parent_Location, Location_Name)
values(1018, 1004, 'Bloemfontein')
insert into location (LocationID, Parent_Location, Location_Name)
values(1019, 1009, 'Durban')

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Paul Keys SSC Eights! Points: 866 More actions · Answer 1

Hi,

Try changing your clause for the inner join to

ON loc.Parent_Location = loh.LocationID

hoseam SSCertifiable Points: 5533 More actions · Answer 2

hoseam

SSCertifiable

Points: 5533

November 12, 2013 at 4:11 am

#1665688

Thank you.

Luis Cazares SSC Guru Points: 183706 More actions · Answer 3

Paul Keys (11/12/2013)
Hi,
Try changing your clause for the inner join to
ON loc.Parent_Location = loh.LocationID

With this change, he can loose the WHERE clause 🙂

Luis C.
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