SQL中树形结构数据的分层更新查询

Question

create table #tmp(ChildID nvarchar(50),ParentID nvarchar(50), Percentage numeric(8,2))
insert into #tmp values ('1', NULL,NULL)
insert into #tmp values ('1.1', '1',89)
insert into #tmp values ('1.2', '1',NULL)
insert into #tmp values ('1.2.1','1.2',96)
insert into #tmp values ('1.2.2', '1.2',NULL)
insert into #tmp values ('1.2.2.1', '1.2.2',87)
insert into #tmp values ('1.2.2.2', '1.2.2',NULL)
insert into #tmp values ('1.2.2.2.1', '1.2.2.2',87)

I am trying CTE update but couldn't attack the expected result yet. Can some one help in this.

Answer 1

I think this is what you want:

With cte as
(Select ChildId, Sum(Percentage) as [percent] from (
Select t1.ChildID,t1.Percentage as oldPercent, t2.ParentID, t2.Percentage from #tmp t1 
join #tmp t2 on t2.ParentID like t1.ChildID +'%')c 
group by ChildId
)
Update #tmp 
set Percentage = cte.[percent]
from #tmp join cte
on #tmp.ChildID = cte.ChildID

Answer 2

Have a look at this.

DECLARE @tmp TABLE  (ChildID NVARCHAR(50)
                   ,ParentID NVARCHAR(50)
                   ,Percentage NUMERIC(8, 2)
                   )
INSERT  INTO @tmp   VALUES  ('1', NULL, NULL) 
INSERT  INTO @tmp   VALUES  ('1.1', '1', 89)
INSERT  INTO @tmp   VALUES  ('1.2', '1', NULL)
INSERT  INTO @tmp   VALUES  ('1.2.1', '1.2', 96)
INSERT  INTO @tmp   VALUES  ('1.2.2', '1.2', NULL)
INSERT  INTO @tmp   VALUES  ('1.2.2.1', '1.2.2', 57)
INSERT  INTO @tmp   VALUES  ('1.2.2.2', '1.2.2', NULL)
INSERT  INTO @tmp   VALUES  ('1.2.2.2.1', '1.2.2.2', 62);

WITH    cteTree
          AS (SELECT    t1.ChildID, t1.childid AS OriginalID
              ,         t1.Percentage
              FROM      @tmp t1
              UNION ALL
              SELECT t2.ChildID
              ,      c.OriginalID
              ,      t2.Percentage
              FROM      @tmp t2
              JOIN cteTree c ON t2.parentID = c.ChildID
             )

SELECT OriginalID AS ChildID, SUM(cteTree.Percentage)
FROM cteTree
GROUP BY OriginalID
ORDER BY cteTree.OriginalID

The other guys were pretty close, but needs to iterate slightly differently, and iteration can be tricky if you don't use it a lot.

Answer 3

You can try this :

DECLARE  @temp table(ChildID nvarchar(50),ParentID nvarchar(50), Percentage numeric(8,2))
insert into @temp values ('1', NULL,NULL)
insert into @temp values ('1.1', '1',89)
insert into @temp values ('1.2', '1',NULL)
insert into @temp values ('1.2.1','1.2',96)
insert into @temp values ('1.2.2', '1.2',NULL)
insert into @temp values ('1.2.2.1', '1.2.2',57)
insert into @temp values ('1.2.2.2', '1.2.2',NULL)
insert into @temp values ('1.2.2.2.1', '1.2.2.2',62)

;With cte
AS
(
select  * ,ROW_NUMBER()Over(Order by (select NULL))Rn  from @temp
)
Select 
ChildID
,ParentID
,Case when Percentage IS NULL Then (select SUM(c.Percentage) From Cte c Where c.Rn>cte.Rn) Else Percentage END Percentage
from cte