SQL CTE -> Carry a value through from anchor to all rows - sql

Question

I have a cte that just cycle throughs a table linking to itself through a child/parent relationship. I have a seed query and I want to carry a value from the seed query to all it's descendants so that all the rows know which seed it came from. Any way to do this?
WITH cte
AS (select Me, MyParent, Attribute
from MyTable
where
Attribute in
(
847
,1011
,1019
)
UNION ALL
SELECT Link.Me, Link.Parent, Link.Attribute
FROM cte
JOIN LINK ON cte.Me = S.Parent
)

Answer 1

WITH cte
AS (
select Me, MyParent, Attribute, 'valueToCarry' value_to_Carry
from MyTable
where
Attribute in
(
847
,1011
,1019
)
UNION ALL
SELECT Link.Me, Link.Parent, Link.Attribute, cte.value_to_carry
FROM cte
JOIN LINK ON cte.Me = S.Parent
)
EDIT after comments:
WITH cte
AS (
select Me, MyParent, Attribute, Attribute RootAttr
from MyTable
where
Attribute in
(
847
,1011
,1019
)
UNION ALL
SELECT Link.Me, Link.Parent, Link.Attribute, cte.RootAttr
FROM cte
JOIN LINK ON cte.Me = S.Parent
)

Answer 2

Here's an example of a recursive CTE that works on SQL Server.
You basically pass the values from the cte to the second query in the cte.
It's called recursive because the cte calls itself, which makes it loop through all the parents till no parent can be linked anymore.
-- using a table variable, cos it's a demonstration
declare #MyTable table (Child int, Parent int, Attribute int);
insert into #MyTable (Child, Parent, Attribute) values
(1,2,847),
(1,3,847),
(2,0,1011),
(3,4,1019),
(4,0,1019);
WITH CTE
AS (
-- the seed records, where the cte starts
select
Child, Parent, Attribute,
Child as RootChild, Attribute as RootAttribute, 0 as PreviousChild, 0 as Level
from #MyTable
where Attribute in (847, 1011, 1019)
union all
-- the records linked to the previously new records in the CTE
SELECT
link.Child, link.Parent, link.Attribute,
-- we also take fields from the cte to get the previous data that was put in the resultset of the cte
cte.RootChild, cte.RootAttribute, cte.Child as PreviousChild, cte.Level + 1 as Level
FROM cte
JOIN #MyTable link ON (cte.Parent = link.Child)
)
select * from cte
order by RootChild, Level;
-- This time we link to the link.Parent which will give different results
WITH CTE
AS (
select
Parent, Child, Attribute,
Parent as RootParent, Attribute as RootAttribute, 0 as PreviousParent, 0 as Level
from #MyTable
where Attribute in (847, 1011, 1019)
union all
SELECT
link.Parent, link.Child, link.Attribute,
cte.RootParent, cte.RootAttribute, cte.Parent as PreviousParent, cte.Level + 1 as Level
FROM cte
JOIN #MyTable link ON (cte.Child = link.Parent)
)
select * from cte
order by RootParent, Level;