В Microsoft SQL Server, следующие работы, но производит:реверсивный порядок сортировки КТР
, сын, папа, дедушка, прадедушка
тогда мне нужно сказать:
прадедушка, дедушка, папа, сын
declare @Family Table(
ID Int Identity(100,1) Primary Key
,Person varchar(128)
,ParentID Int default 0
)
insert into @Family(Person,ParentID) values('Great Granddad',0)
insert into @Family(Person,ParentID) values('Granddad',100)
insert into @Family(Person,ParentID) values('Dad',101)
insert into @Family(Person,ParentID) values('Son',102)
DECLARE @ID Int = 103
;with cte1 as (
select
@ID AS cteID
,ID
,ParentID
,Person as ctePerson
from @Family
where ID = @ID -- this is the starting point you want in your recursion
UNION ALL
select @ID, F.ID, F.ParentID, F.Person
from @Family F
join cte1 P on P.ParentID = F.ID -- this is the recursion
)
-- cte2 can reverse the sort order based on something built in (OVER?)
-- ROW_NUMBER() OVER(ORDER BY ? DESC) AS Row
,cte3 AS(
select ID as cte3ID,(
SELECT ',' + ctePerson
FROM cte1
WHERE cteID = F.ID
FOR XML PATH ('')
) as People
from @Family F
where [email protected]
)
SELECT * FROM CTE3
Человек, который так приятно. –