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get all children in a parent child table

Posted on 2010-11-23
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Last Modified: 2012-05-10
i have a table with 3 Fields Name ,ID ,ParentID  I'm looking for sql statement which should give me back all the children id which belong the the parent for example
Name      ID      ParentID
A      1      Null
B      2      1
C      3      1
D      4      2
E      5      2
F      6      3
G      7      3
H      8      9
I       9      8
J      10      8
K      11      8
L      12      10
now i need a sql which i will give (1) and the result should be
2
3
4
5
6
7
this all the children and grandchildren from id 1
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Comment
Question by:Mr_Ezi
8 Comments
 
LVL 58

Expert Comment

by:cyberkiwi
Comment Utility
;with cte as (
select id from tbl where id=1
union all
select tbl.id from cte, tbl where tbl.parentID=cte.id)
select id from cte
where id != 1
order by id
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Author Comment

by:Mr_Ezi
Comment Utility
it only give me back the only id 1
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LVL 58

Expert Comment

by:cyberkiwi
Comment Utility
Mr Ezi,
Are you sure you are copy-pasting/modifying correctly?
The 2nd to last line specifically says "where id != 1" so it should never return 1, regardless of what else it returns.
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Author Comment

by:Mr_Ezi
Comment Utility
sorry you right i dint copy now go it over it didn't give me back any think just a empty table
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LVL 58

Expert Comment

by:cyberkiwi
Comment Utility
If you are modifying the query in any significant way, you need to show us the full query you have used. Did you copy and paste verbatim, and are the fields exactly as shown in the question?

The only text that should be changed in the query is where it says "tbl", to your real table name.
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LVL 32

Expert Comment

by:ewangoya
Comment Utility

;WITH CTE(Name, ID, ParentID)
AS
(
      SELECT Name, ID, ParentID
      FROM TABLE1
      WHERE ParentID = 1
      UNION ALL
      SELECT A.Name, A.ID, A.ParentID
      FROM TABLE1 A
      INNER JOIN CTE B ON B.ID = A.ParentID
)
SELECT Name, ID, ParentID
FROM CTE
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LVL 1

Expert Comment

by:_DJ
Comment Utility

;WITH CTE(ID)
AS
(
      SELECT ID FROM YourTableName WHERE ParentID = 1
      UNION ALL
      SELECT YT.ID FROM YourTableName YT INNER JOIN CTE TC
		 ON TC.ID = YT.ParentID
)

SELECT ID FROM CTE ORDER BY ID

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LVL 4

Accepted Solution

by:
parthmalhan earned 500 total points
Comment Utility
Try the following code:

--This will create a temp table and insert values in it
create table #t(name varchar(max),id int,pid int)
insert into #t
select 'muni',1,null union all
select 'yash',2,1 union all
select 'gob',3,1 union all
select 'gop',4,1 union all
select 'ash',5,2 union all
select 'vim',6,2 union all
select 'man',7,3 union all
select 'bab',8,3 union all
select 'nee',9,4 union all
select 'nin',10,4

select * from #t

--real Query
with tree(Child,Text,Parent) as
(
 select id,name,pid from #t
 where pid=1 --put parent id here
 union all
 select z.id,z.name,z.pid from  #t z
 inner join tree on tree.Child=z.pid
)select * from tree

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