RE: SQL Brain Teaser Challenge

select *
from treenode
order by translate(description || 0, '0123456789abcdefghijklmnopqrstuvwxyz ', '0123456789')

Jerry Whittle
ACIFICS DBA
NCI Information Systems Inc.
jerome.whittle_at_scott.af.mil
618-622-4145

> -----Original Message-----
> From: Orr, Steve [SMTP:sorr_at_rightnow.com]
>
> Challenge: present SQL results hierarchically and sort the nodes. Use sort
> column without changing data. Here's the DDL/DML to start:
>
> create table treenode (
> id number not null
> constraint pk_treenode primary key,
> parentid number not null,
> nodeorder number not null,
> description varchar2(20) null);
>
> insert into treenode values(1,0,0,'top folder');
> insert into treenode values(9,1,0,'1st subfolder');
> insert into treenode values(7,1,2,'3rd subfolder');
> insert into treenode values(2,1,1,'2nd subfolder');
> insert into treenode values(8,7,1,'folder 3 item 2');
> insert into treenode values(6,2,3,'folder 2 item 3');
> insert into treenode values(5,7,0,'folder 3 item 1');
> insert into treenode values(3,2,2,'folder 2 item 2');
> insert into treenode values(4,2,1,'folder 2 item 1');
> -----------------------------------------------------
> Here's the data presented hierachically without the desired sort:
> select * from treenode
> start with parentid=0 connect by prior id = parentid;
> ID PARENTID NODEORDER DESCRIPTION
> ---------- ---------- ---------- --------------------
> 1 0 0 top folder
> 9 1 0 1st subfolder
> 7 1 2 3rd subfolder
> 8 7 1 folder 3 item 2
> 5 7 0 folder 3 item 1
> 2 1 1 2nd subfolder
> 6 2 3 folder 2 item 3
> 3 2 2 folder 2 item 2
> 4 2 1 folder 2 item 1
> -----------------------------------------------------
> Desired SQL statement results:
> ID PARENTID NODEORDER DESCRIPTION
> ---------- ---------- ---------- --------------------
> 1 0 0 top folder
> 9 1 0 1st subfolder
> 2 1 1 2nd subfolder
> 4 2 1 folder 2 item 1
> 3 2 2 folder 2 item 2
> 6 2 3 folder 2 item 3
> 7 1 2 3rd subfolder
> 5 7 0 folder 3 item 1
> 8 7 1 folder 3 item 2
> -----------------------------------------------------
>
> Kudos to anyone who can figure out how to do this via SQL.
>
> Steve Orr
> Bozeman, Montana
>

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-- 
Author: Whittle Jerome Contr NCI
  INET: Jerome.Whittle_at_scott.af.mil

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