Re: Hierarchical Subquery must omit nodes
Date: Thu, 17 Apr 2008 08:54:13 -0700 (PDT)
Message-ID: <914f2a70-fc6d-4462-9ad5-73100cd02578@l64g2000hse.googlegroups.com>
On Apr 17, 10:45 am, "fitzjarr..._at_cox.net" <orat..._at_msn.com> wrote:
> On Apr 17, 10:09 am, "Chris L." <diver..._at_uol.com.ar> wrote:
>
>
>
>
>
> > On Apr 16, 6:43 pm, Urs Metzger <u..._at_ursmetzger.de> wrote:
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> > > fitzjarr..._at_cox.net schrieb:
>
> > > > On Apr 16, 2:21 pm, "Shakespeare" <what..._at_xs4all.nl> wrote:
> > > >> "fitzjarr..._at_cox.net" <orat..._at_msn.com> schreef in berichtnews:57056886-02e4-4188-9b29-b7ddf517bbb7_at_a70g2000hsh.googlegroups.com...
> > > >> On Apr 16, 12:16 pm, "Chris L." <diver..._at_uol.com.ar> wrote:
>
> > > >>> Hi all,
> > > >>> I thought this would be easy but it's turning out to be pretty
> > > >>> difficult.
> > > >>> I need a hierarchical query to omit nodes present in a EXCLUDED_NODES
> > > >>> table.
> > > >>> Omitted nodes' children should be omitted too.
> > > >>> See this example taken
> > > >>> fromhttp://download.oracle.com/docs/cd/B10501_01/server.920/a96540/functi...
> > > >>> SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name, '/')
> > > >>> "Path"
> > > >>> FROM employees
> > > >>> START WITH last_name = 'Kochhar'
> > > >>> CONNECT BY PRIOR employee_id = manager_id;
> > > >>> Path
> > > >>> ---------------------------------------------------------------
> > > >>> /Kochhar
> > > >>> /Kochhar/Greenberg
> > > >>> /Kochhar/Greenberg/Faviet
> > > >>> /Kochhar/Greenberg/Chen
> > > >>> /Kochhar/Greenberg/Sciarra
> > > >>> /Kochhar/Greenberg/Urman
> > > >>> /Kochhar/Greenberg/Popp
> > > >>> /Kochhar/Whalen
> > > >>> /Kochhar/Mavris
> > > >>> /Kochhar/Baer
> > > >>> /Kochhar/Higgins
> > > >>> /Kochhar/Higgins/Gietz
> > > >>> If I have Greenberg in EXCLUDED_NODES then output should be
> > > >>> Path
> > > >>> ---------------------------------------------------------------
> > > >>> /Kochhar
> > > >>> /Kochhar/Whalen
> > > >>> /Kochhar/Mavris
> > > >>> /Kochhar/Baer
> > > >>> /Kochhar/Higgins
> > > >>> /Kochhar/Higgins/Gietz
> > > >>> Excluded node can be in any depth of the hierarchy (i.e. it could be
> > > >>> Gietz and then Gietz and all of its dependent sub-tree should be
> > > >>> pruned)
> > > >>> I've tried filtering the START WITH and works great but doesn't help
> > > >>> when the excluded node is somewhere deep in the hierarchy.
> > > >>> I've tried filtering the CONNECT BY but it cannot contain subqueries
> > > >>> (manual states this).
> > > >>> I've tried using the SYS_CONNECT_BY_PATH to parse it and see if it
> > > >>> contains an excluded node but I got an Ora-00600 error.
> > > >>> ORA-00600: internal error code, arguments: [rworupo.2], [26670], [1],
> > > >>> [], [], [], [], []
> > > >>> Oracle version is 9i
> > > >>> Thanks in advance!
> > > >>> Chris
> > > >> Why wouldn't this work:
>
> > > >> -- Your original example
> > > >> SQL> SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name, '/')
> > > >> "Path"
> > > >> 2 FROM employees
> > > >> 3 START WITH last_name = 'Kochhar'
> > > >> 4 CONNECT BY PRIOR employee_id = manager_id;
>
> > > >> Path
> > > >> --------------------------------------------------------------------------------
> > > >> /Kochhar
> > > >> /Kochhar/Greenberg
> > > >> /Kochhar/Greenberg/Faviet
> > > >> /Kochhar/Greenberg/Chen
> > > >> /Kochhar/Greenberg/Sciarra
> > > >> /Kochhar/Greenberg/Urman
> > > >> /Kochhar/Greenberg/Popp
> > > >> /Kochhar/Whalen
> > > >> /Kochhar/Mavris
> > > >> /Kochhar/Baer
> > > >> /Kochhar/Higgins
> > > >> /Kochhar/Higgins/Gietz
>
> > > >> 12 rows selected.
>
> > > >> -- 'Filtered' example
> > > >> SQL> select "Path"
> > > >> 2 from
> > > >> 3 (SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name,
> > > >> '/') "Path"
> > > >> 4 FROM employees
> > > >> 5 START WITH last_name = 'Kochhar'
> > > >> 6 CONNECT BY PRIOR employee_id = manager_id)
> > > >> 7 where instr("Path", 'Greenberg') = 0;
>
> > > >> Path
> > > >> --------------------------------------------------------------------------------
> > > >> /Kochhar
> > > >> /Kochhar/Whalen
> > > >> /Kochhar/Mavris
> > > >> /Kochhar/Baer
> > > >> /Kochhar/Higgins
> > > >> /Kochhar/Higgins/Gietz
>
> > > >> 6 rows selected.
>
> > > >> SQL>
>
> > > >> David Fitzjarrell
>
> > > >> --------------------------------
> > > >> This will go wrong if you want to exclude 'Green' but include 'Greenberg'
>
> > > >> Shakespeare- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > A valid concern. I must admit this was a quick and dirty attempt.
>
> > > > And this is with 10.2.0.3.
>
> > > > David Fitzjarrell
>
> > > SQL> create table excluded_nodes(last_name varchar2(25));
>
> > > Tabelle wurde erstellt.
>
> > > SQL> insert into excluded_nodes values('Greenberg');
>
> > > 1 Zeile wurde erstellt.
>
> > > SQL> commit;
>
> > > SQL> SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name, '/') "Path"
> > > 2 FROM (select *
> > > 3 from employees
> > > 4 where last_name not in (select last_name
> > > 5 from excluded_nodes))
> > > 6 START WITH last_name = 'Kochhar'
> > > 7 CONNECT BY PRIOR employee_id = manager_id;
>
> > > Path
> > > --------------------------------------------------------------------------------
> > > /Kochhar
> > > /Kochhar/Whalen
> > > /Kochhar/Mavris
> > > /Kochhar/Baer
> > > /Kochhar/Higgins
> > > /Kochhar/Higgins/Gietz
>
> > > hth,
> > > Urs Metzger
>
> > Thanks Urs, working with a filtered subset and then applying the
> > "connect by" to it is a good idea.
> > Since I would work with employee_id to exclude, do you think it would
> > be best to filter out both employee_id and manager_id? Or is this a
> > non-issue?
>
> > What do you think of this...? sorry about the column name "last_name",
> > it would really contain ids.
>
> > > SQL> SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name, '/') "Path"
> > > 2 FROM (select *
> > > 3 from employees
> > > 4 where not exists (select *
> > > 5 from excluded_nodes where last_name in (employee_id, manager_id) ))
> > > 6 START WITH last_name = 'Kochhar'
> > > 7 CONNECT BY PRIOR employee_id = manager_id;
>
> > Appreciate it!
> > Chris- Hide quoted text -
>
> > - Show quoted text -
>
> Your modification won't work; the id values won't ever match up to
> the associated name and, in this example, you have no employee_id
> column in the excluded_nodes table:
>
> SQL> select *
> 2 from employees
> 3 where not exists (select *
> 4 from excluded_nodes where last_name in
> (employee_id, manager_id) );
> from excluded_nodes where last_name in (employee_id,
> manager_id) )
> *
> ERROR at line 4:
> ORA-01722: invalid number
>
> The query supplied works as expected; if you're having trouble
> 'translating' it to your specific case then post your query and
> someone here can help you with the rewrite.
>
> David Fitzjarrell- Hide quoted text -
>
> - Show quoted text -
Modifying your suggestion slightly produces the incorrect output:
SQL> SELECT LPAD(' ', 2*level-1)||SYS_CONNECT_BY_PATH(last_name, '/')
"Path"
2 FROM (select *
3 from employees e 4 where not exists (select * 5 from excluded_nodes where employee_id in(e.employee_id, e.manager_id) ))
6 START WITH last_name = 'Kochhar'
7 CONNECT BY PRIOR employee_id = manager_id;
Path
/Kochhar
/Kochhar/Greenberg
/Kochhar/Greenberg/Faviet
/Kochhar/Greenberg/Chen
/Kochhar/Greenberg/Sciarra
/Kochhar/Greenberg/Urman
/Kochhar/Greenberg/Popp
/Kochhar/Whalen
/Kochhar/Mavris
/Kochhar/Baer
/Kochhar/Higgins
/Kochhar/Higgins/Gietz
12 rows selected.
I would use the example as posted, and try to modify your original query in a similar manner.
David Fitzjarrell Received on Thu Apr 17 2008 - 10:54:13 CDT