how to sperate the category and its sub category?

Question

2.50/5 (2 votes)

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this is my table structure..

id name parentid
1 Mobile null
2 Nokia 1
3 nokia lumia 2
4 nokia Lumia520 3
5 computer null
6 dell 5
7 lenovo 5
8 dell 697 6
9 lenovo 220 7

now if i select mobile I want output like

mobile
nokia
nokia Lumia
nokia Lumia520

is it possible?

Posted 11-Mar-14 3:04am

utm

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Ankur^\m/ · Answer 1 · 2014-03-11T03:13:00

Solution 1

Yes, it is possible. You will need to use Common Table Expressions (CTE)[^] here. For more details see the MS Technet article - Recursive Queries Using Common Table Expressions
[^]

Posted 11-Mar-14 3:13am

Ankur^\m/

Comments

utm 11-Mar-14 10:37am

thanks..
i never heard about this..
i got new things to learn..

King Fisher · Answer 2 · 2014-03-11T03:21:00

Solution 2

use this:

SQL

with cte(parent_id,id)
as
(
select parent_id,Id from table where parent_id is null
union all

select parent_id,ID from table as a inner join cte as b on b.id=a.parent_id
)
select *from cte

Posted 11-Mar-14 3:21am

King Fisher

Comments

Ankur^\m/ 11-Mar-14 9:24am

I left that for the user to understand and try himself/herself.

Tom Marvolo Riddle 11-Mar-14 9:29am

I agree with you.+5 for that

Ankur^\m/ 11-Mar-14 9:31am

Thank you!

King Fisher 11-Mar-14 9:32am

i hope he will learn from your link .i thought he stuck with that. :)