Groups > comp.databases.ms-sqlserver > #476

Re: Generating a tree structure from data

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: Generating a tree structure from data
Date	Wed, 22 Jun 2011 22:18:04 +0200
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Steve (steve.simpson@aircelle.com) writes:
> parent is either blank, Y (meaning there are child links) and H
> (meaning it's the top level of a structure)

That's an unusual column for that type of structure. I don't see what it 
adds. Usually this relation is encoded in the ids. And what does blank mean?

> I want to be able to create a procedure that recusively loops through
> the table (intradtl) and outputs an indented structure of the file
> 
> Level    description
> ..0         <<iddesc>>
> ...1        <<iddesc>>
> .....2      <<iddesc>>
> ...1        <<iddesc>>
> etc

So ignoring Parent, and assuming that you are on SQL 2005 or later, you
can do:

WITH rekurs AS (
   SELECT icode, iddesc, lvl = 0
   FROM   intradt1
   WHERE  idcode IS NULL
   UNION  ALL
   SELECT i. icode, i.iddesc, r.lvl + 1
   FROM   intradt1 i
   JOIN   rekurs r ON  i.idcode = i.code
)
SELECT replicate('.', lvl + 2) + ltrim(str(lvl)), idddesc
FROM   rekurs

-- 
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Links for SQL Server Books Online:
SQL 2008: http://msdn.microsoft.com/en-us/sqlserver/cc514207.aspx
SQL 2005: http://msdn.microsoft.com/en-us/sqlserver/bb895970.aspx

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Thread

Generating a tree structure from data Steve <steve.simpson@aircelle.com> - 2011-06-22 02:40 -0700
  Re: Generating a tree structure from data Erland Sommarskog <esquel@sommarskog.se> - 2011-06-22 22:18 +0200
  Re: Generating a tree structure from data --CELKO-- <jcelko212@earthlink.net> - 2011-06-23 07:36 -0700
  Re: Generating a tree structure from data rembrandt <batesbrandt@gmail.com> - 2011-06-29 04:47 -0700

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