Building the tree balanced with SQL hierarchical queries

Hi all

I have the following hierarchical data with different levels of subtree:

A0
-A001
-A00101
A1
-A101
A2
-A201
-A20101
-A201010001

A0 subtree has 3 levels, A1 subtree has 2 levels and subtree of the A3 is level 4. I want to generate a tree balanced on the data with all levels of the subtree equal to the maximum number of levels available in the whole tree which, in this particular case, is 4.

I don't know that it is possible with SQL. Script to generate the above mentioned are as below:

CREATE TABLE codes_tree
(node_id VARCHAR2 (10))
parent_node_id VARCHAR2 (10)
);
INSERT INTO codes_tree VALUES ('A0', NULL);
INSERT INTO codes_tree VALUES ('A001', 'A0');
INSERT INTO codes_tree VALUES ('A00101', 'A001');
---
INSERT INTO codes_tree VALUES ('A1', NULL);
INSERT INTO codes_tree VALUES ('A101', 'A1');
---
INSERT INTO codes_tree VALUES ('A2', NULL);
INSERT INTO codes_tree VALUES ('A201', 'A2');
INSERT INTO codes_tree VALUES ('A20101', 'A201');
INSERT INTO codes_tree VALUES ('A201010001', 'A20101');

Any help will be much appreciated.

Thank you... Best regards

Published by: naive2Oracle on May 12, 2011 19:40

Published by: naive2Oracle on May 12, 2011 19:41

Hello

Of course, you can do it in SQL.
One way is to take the normal output of hierarchical and manipulate the result set so that the leaves are repeated as often as necessary to make all branches of the same length. I have Oracle 10.2 available right now, so here's a solution that will work in Oracle 10 (and more):

WITH     original_hierarchy     AS
(
     SELECT     node_id
     ,     LEVEL               AS lvl
     ,     CONNECT_BY_ISLEAF     AS isleaf
     ,     ROWNUM               AS rnum
     FROM     codes_tree
     START WITH     parent_node_id     IS NULL
     CONNECT BY     parent_node_id     = PRIOR node_id
)
,     got_max_lvl     AS
(
     SELECT     o.*
     ,     MAX (lvl) OVER ()     AS max_lvl
     FROM     original_hierarchy     o
)
SELECT       LPAD ( ' '
            , 3 * ( ( d.lvl
                 + NVL (c.rnum, 1)
                 - 1
                 )
               - 1
               )
            ) || CASE
               WHEN c.rnum > 1
               THEN '*' || d.node_id || '*'
               ELSE        d.node_id
              END          AS display_id
FROM            got_max_lvl     d
LEFT OUTER JOIN       got_max_lvl     c  ON     d.isleaf     = 1
                       AND     c.rnum          <= 1 + d.max_lvl - d.lvl
ORDER BY  d.rnum
,       c.rnum
;

With the help of Oracle 11.2, it would be preferable to generate original_hierarchy as above, but to manipulate using a WITH recursive clause.
Analytical functions often interfere with CONNECT BY, so I used a separate subquery to get max_lvl, do CONNECT BY in a sub-querry and analytic function in a separate subquery. I don't know what is needed on all versions.

Output of your sample data:

DISPLAY_ID
-------------------------------
A0
   A001
      A00101
         *A00101*
A1
   A101
      *A101*
         *A101*
A2
   A201
      A20101
         A201010001

Below is a generic version of the same query, which I used to test this on scott.emp:

DEFINE     table_name     = scott.emp
DEFINE     id_col          = empno
DEFINE     parent_id_col     = mgr
DEFINE     display_col     = ename

WITH     original_hierarchy     AS
(
     SELECT     &display_col          AS display_txt
     ,     LEVEL               AS lvl
     ,     CONNECT_BY_ISLEAF     AS isleaf
     ,     ROWNUM               AS rnum
     FROM     &table_name
     START WITH     &parent_id_col     IS NULL
     CONNECT BY     &parent_id_col     = PRIOR &id_col
)
,     got_max_lvl     AS
(
     SELECT     o.*
     ,     MAX (lvl) OVER ()     AS max_lvl
     FROM     original_hierarchy     o
)
SELECT       LPAD ( ' '
            , 3 * ( ( d.lvl
                 + NVL (c.rnum, 1)
                 - 1
                 )
               - 1
               )
            ) || CASE
               WHEN c.rnum > 1
               THEN '*' || d.display_txt || '*'
               ELSE        d.display_txt
              END          AS display_id
FROM            got_max_lvl     d
LEFT OUTER JOIN       got_max_lvl     c  ON     d.isleaf     = 1
                       AND     c.rnum          <= 1 + d.max_lvl - d.lvl
ORDER BY  d.rnum
,       c.rnum
;

Output:

DISPLAY_ID
-----------------------------
KING
   JONES
      SCOTT
         ADAMS
      FORD
         SMITH
   BLAKE
      ALLEN
         *ALLEN*
      WARD
         *WARD*
      MARTIN
         *MARTIN*
      TURNER
         *TURNER*
      JAMES
         *JAMES*
   CLARK
      MILLER
         *MILLER*

Published by: Frank Kulash, May 13, 2011 06:38
Adding the generic version

Tags: Database

Similar Questions

How to order a tree balanced with SQL hierarchical queries
by searching the forum I found this

Re: Generate tree balanced with SQL hierarchical queries

is there a way I can order this tree in alphabetical order so that the result looks like

LEVEL INDENTED_ENAME
---------- --------------------
1 KING BED
2 BLAKE
3 ALLEN
3 JAMES
MARTIN 3
3 TURNER
WARD 3
2 CLARK
3 MILLER
2 JONES
3 FORD
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-the original query-

SELECT THE LEVEL
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FROM scott.emp
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CONNECT BY PRIOR empno = mgr
;

LEVEL INDENTED_ENAME
---------- --------------------
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2 JONES
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2 BLAKE
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MARTIN 3
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Hello

Bodin wrote:
Hi Frank, I can order it selectively depending on the level, which means that only siblings stopped at third level, but rest of the brothers and sisters remain Nations United ordered

It's actually quite difficult. You can "ORDER of brothers and SŒURS BY CASE... ', like this:
```
SELECT  LEVEL
,      LPAD (' ', 3 * LEVEL) || ename     AS indented_ename
FROM      scott.emp
START WITH        mgr     IS NULL
CONNECT BY         mgr      = PRIOR empno
ORDER SIBLINGS BY  CASE
               WHEN  job = 'MANAGER'  THEN  ename
                                          ELSE  NULL
             END
;
```
In this case to get desired results in table scott.emp, as the lines are LEVEL = 2 if and only if use = "MANAGER".
But if you reference LEVEL in the CASE expression (for example, if you replace ' job = 'MANAGER' ' with "2 LEVEL =" above "), then you will get the error" ORA-00976: LEVEL, PRIOR or ROWNUM not allowed here. "
The best way I can think to do exactly what you asked is to do 2 CONNECT BY queries; one just to get the LEVEL and the other for the brothers and SŒURS ORDER BY:
{code}
WITH got_lvl AS
(
SELECT LEVEL AS lvl
Bishop
empno
ename
FROM scott.emp
START WITH mgr IS NULL
CONNECT BY PRIOR empno = mgr
)
SELECT lvl
, LPAD (' ', 3 * LEVEL) | Ename AS indented_ename
OF got_lvl
START WITH mgr IS NULL
CONNECT BY PRIOR empno = mgr
BROTHERS AND SŒURS OF ORDER OF CASES
ONCE lvl = 2 THEN ename
ANOTHER NULL
END
;
{code}
Why you can't simply "Brothers and SŒURS of ORDER BY ename" at all levels? If all you care is the order of the items of LEVEL = 2, then this is probably the most effective and simplest way. It really hurt anything if nodes on levels 3, 4, 5,... are in order, too?

Here's something you can do if you want to order by different unique things to different levels:
{code}
WITH got_sort_key AS
(
SELECT LEVEL AS lvl
, LPAD (' ', 3 * LEVEL) | Ename AS indented_ename
empno
SYS_CONNECT_BY_PATH (LPAD (CASE
WHEN LEVEL = 2
THEN ename
Of OTHER TO_CHAR (empno)
END
10
)
, ','
) AS sort_key
FROM scott.emp
START WITH mgr IS NULL
CONNECT BY PRIOR empno = mgr
)
SELECT lvl
indented_ename
empno
OF got_sort_key
ORDER BY sort_key
;
{code}
However, all possible values of the CASE expression must uniquely identify the node; otherwise, the output won't necessarily hierarchical order. You can assign arbitrary unique IDS to the lines (using the ROW_NUMBER analytic function, for example), but that requires another subquery and is also complex and perhaps as ineffective as the solution above with 2 garages CONNECT.

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  5  /

Index created.

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----------------------------------------------------------------
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  4  /

CLOB_COLUMN
--------------------------------------------------------------------------------
21-12345
21 & 12345

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SCOTT@orcl_11gR2> select *
  2  from   your_table
  3  where  contains (clob_column, '21 & 12345') > 0
  4  /

CLOB_COLUMN
--------------------------------------------------------------------------------
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Build the error associated with a class - why?

I have a class that I am creating I can use in any application as a utility class to call the browser.

However, when I add this class to an application - any application, including the HelloCascades - the build fails.

By comparing the console logs I see this at the end of a good generation (without this class)

"
CQS-Vgcc_ntox86-lang-c ++ - Wl, - rpath - link, C:, bbndkbeta4, target_10_0_9_1101, qnx6 / x 86/lib - Wl, - rpath - link, C:, bbndkbeta4, target_10_0_9_1101, qnx6 / x 86/usr/lib - o o-g/hellocascades o-g/.obj/hellocascadesapp.o o-g/.obj/main.o o-g/.obj/moc_hellocascadesapp.o - LC: / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/lib - LC: / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/usr/lib - LC : / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/usr/lib/qt4/lib-LC: / bbndkbeta4/target_10_ 0_9_1101/qnx6 / / usr/lib/qt4/lib - lbb - lbbcascades - lQtDeclarative - lQtScript - lQtSvg - lQtSql - lQtXmlPatterns - lQtXml - lQtGui - lQtNetwork - lsocket - lQtCore - lm - lbps
make [2]: leaving directory had: / downloads/BB10/samples/Cascades-samples-master/hellocascades / x 86 '
make [1]: leaving directory had: / downloads/BB10/samples/Cascades-samples-master/hellocascades / x 86 '
Not find qmake configuration directoryCould not found qmake extended from fichierExemple to use OS configuration before installing MAKEFILE_GENERATOR

"

But I can't see the following at the end of the construction that fails:

"

CQS-Vgcc_ntox86 - c - Wno-psabi-lang-c ++ g - Wno-psabi-wall-W-D_REENTRANT-DQT_NO_IMPORT_QT47_QML-DQ_OS_BLACKBERRY-DQT_DECLARATIVE_LIB-DQT_SCRIPT_LIB-DQT_SVG_LIB-DQT_SQL_LIB-DQT_XMLPATTERNS_LIB-DQT_XML_LIB-DQT_GUI_LIB-DQT_NETWORK_LIB-DQT_CORE_LIB-DQT_SHARED - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/share/qt4/mkspecs/no taken into charge/blackberry - x 86 - CQS -... /... /hellocascades - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtCore - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtNetwork - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtGui - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtXml - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtXmlPatterns - Ic : / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtSql - Ic: / bbndkbeta4/target_10_0_9_1101 / QNX6/usr/include/qt4/QtSvg - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtScript - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4/QtDeclarative - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/qt4 - I... / SRC-Io-g/.moc - Ic : / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include - Ic: / bbndkbeta4/target_10_0_9_1101/qnx6/usr/include/freetype2 - i. o o-g/.obj/hellocascadesapp.o... /SRC/hellocascadesapp.cpp
CQS-Vgcc_ntox86-lang-c ++ - Wl, - rpath - link, C:, bbndkbeta4, target_10_0_9_1101, qnx6 / x 86/lib - Wl, - rpath - link, C:, bbndkbeta4, target_10_0_9_1101, qnx6 / x 86/usr/lib - o o-g/hellocascades o-g/.obj/hellocascadesapp.o o-g/.obj/invokeBrowser.o o-g/.obj/main.o o-g/.obj/moc_hellocascadesapp.o o-g/.obj/moc_invokeBrowser.o - LC: / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/lib - LC: / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/usr/lib - LC : / bbndkbeta4/target_10_0_9_1101/qnx6 / x 86/usr / lib/qt4/lib - LC: / bbndkbeta4/target_10_0_9_1101/qnx6 / / usr/lib/qt4/lib - lbb - lbbcascades - lQtDeclarative - lQtScript - lQtSvg - lQtSql - lQtXmlPatterns - lQtXml - lQtGui - lQtNetwork - lsocket - lQtCore - lm - lbps
Not find qmake configuration not found directoryCould extended fichierExemple of use OS qmake configuration before you set MAKEFILE_GENERATORC:\bbndkbeta4\host_10_0_9_284\win32\x86\usr\bin\ntox86-ld: o-g/.obj/invokeBrowser.o: reference to undefined symbol '_ZN2bb6system13InvokeRequest11setMimeTypeERK7QString'
make [2]: leaving directory had: / downloads/BB10/samples/Cascades-samples-master/hellocascades / x 86 '
make [1]: leaving directory had: / downloads/BB10/samples/Cascades-samples-master/hellocascades / x 86 '
C:\bbndkbeta4\host_10_0_9_284\win32\x86\usr\bin\ntox86-ld: Notes: '_ZN2bb6system13InvokeRequest11setMimeTypeERK7QString' is defined in DSO C:/bbndkbeta4/target_10_0_9_1101/qnx6/x86/usr/lib/libbbsystem.so.1 try so add to the linker command line
C:/bbndkbeta4/target_10_0_9_1101/QNX6/x86/usr/lib/libbbsystem.so.1: could not read symbols: invalid operation
CC: C:/bbndkbeta4/host_10_0_9_284/win32 / x 86/usr/bin/ntox86-ld caught signal 1
make [2]: * [o-g/hellocascades] error 1
make [1]: * [debug] error 2
make: * [Simulator-Debug] error 2

"

I build to debug on the Simulator. I tried the built device and these failure too. I also tried 3 Beta and Beta 4.

If you look hard you will see in the Console log this:

ZN2bb6system13InvokeRequest11setMimeTypeERK7QString

Now if I comment the line defining the Mime type, this changes then to complain about

_ZN2bb6system13InvokeRequest6setUriERK7QString

My apologies in advance for the code. Probably more like to kill, and I'm sure that the code I created is bad c ++, since in reality, I'm a Java learning C++ programmer. But that being said, I would still like t understand why this class causes the build error.

TIA
```
/*
 * InvokeBrowser.h
 *
 *  Created on: 30 Nov 2012
 *      Author: ps
 */

#ifndef INVOKEBROWSER_H_
#define INVOKEBROWSER_H_

#include 
#include 
#include 
#include 
#include 

class InvokeBrowser : public QObject {

      Q_OBJECT

public:
    InvokeBrowser(bb::cascades::Container *parent = 0);
    virtual ~InvokeBrowser();

    void launchBrowser(QString);

private:
    void processInvokeReply();
    void showToast(const QString );

    bb::system::InvokeManager* _invokeManager;
    bb::system::InvokeReply * _invokeReply;
    bb::system::InvokeRequest * _request;
};

#endif /* INVOKEBROWSER_H_ */
```
```
/*
 * InvokeBrowser.cpp
 *
 *  Created on: 30 Nov 2012
 *      Author: ps
 */

#include "InvokeBrowser.h"

#include 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

InvokeBrowser::InvokeBrowser(bb::cascades::Container *parent)
    : QObject(parent)  {
}

InvokeBrowser::~InvokeBrowser() {
    // TODO Auto-generated destructor stub
    if ( ! _invokeManager ) {
        delete _invokeManager;
        _invokeManager = 0;
    }
    if ( _request ) {
        delete _request;
        _request = 0;
    }
}

void InvokeBrowser::launchBrowser(const QString URL) {

    // Create a new invocation request
    _request = new bb::system::InvokeRequest();
    _request->setAction(QLatin1String("bb.action.OPEN"));
    _request->setMimeType(QLatin1String("text/html"));
    _request->setUri(URL);

    // Start the invocation
    _invokeManager = new bb::system::InvokeManager();
    _invokeReply = _invokeManager->invoke(*_request);

    if (_invokeReply) {
        // Ensure that processInvokeReply() is called when the invocation has finished
        connect(_invokeReply, SIGNAL(finished()), this, SLOT(processInvokeReply()));
    } else {
        showToast("Error starting browser");
        return;
    }

}

void InvokeBrowser::processInvokeReply() {

    if ( !_invokeReply ) {
        return;
    }
    // Check for errors during invocation
    switch (_invokeReply->error()) {
        case bb::system::InvokeReplyError::BadRequest:
            showToast("[ErrorBadRequest] Invoke Failed!");
            break;
        case bb::system::InvokeReplyError::Internal:
            showToast("[ErrorInternal] Invoke Failed!");
            break;
        case bb::system::InvokeReplyError::NoTarget:
            showToast("[ErrorNoTarget] Invoke Failed!");
            break;
        case bb::system::InvokeReplyError::TargetNotOwned:
            showToast("[ErrorTargetNotOwned] Invoke Failed.");
            break;
        default:
            break;
    }
    // Delete the reply later on
    _invokeReply->deleteLater();
    _invokeReply = 0;

}

void InvokeBrowser::showToast(const QString toastString) {
    qDebug()<<"Toast: " + toastString;

    bb::system::SystemToast *toast = new bb::system::SystemToast();
    toast->setBody(toastString);
    toast->show();

}
```
try adding bbsystem library to the list of link libraries

The white balance with the new update problem

Just updated to lightroom and now this happens every time I try to change the balance of whites, very annoying when you are using a controller k 4 having to move the mouse backward and that transmits up to now.

Hi all

This issue should be fixed in the 2015.6.1 CC update that went live today. Please upgrade to Lightroom to the latest version.

More info here: Lightroom CC now available 2015.6.1

Concerning

Pete

Cannot build the site offline with absolute links

Hello.
I'm building a site offline before uploading to the server.
At first I just use relative links, so everything is fine. But now that I've changed the absolute links, I can't get a preview of my work because all of the scripts, style sheets, images, etc. are linking to an online address that does not exist yet.
In site manager, I put in my local root folder information, and my http address. It seems to me that Dreamweaver must be able to substitute the local root folder for the http address and thus be able to process the links locally. But this doesn't seem to be the case.
So, how can I work offline but use absolute links in my documents.
Thank you.

> I went to absolute links because I have

> my pages in separate directories and names of

> these directories may change.

I'm not. If directory names are changing, you must update the links - you were using absolute and relative root site or document relative links. Of course, if you change the name of the directory in DW, it will update all your links for your - unless you use absolute links. DW does not have absolute links.

Fill in the select list with two different queries depending on the user's group
Hello

I finished my first production application using apex. I have a Select list that takes its values from a sql query. Now, I want this different query for each user based on the group. Basically each user sees only the projects they are responsible - that works fine. But I want all the people of the admin group to see all the projects - how can I do this?

Thank you very much!!!
Henrik
Hello

Try this
```
SELECT s.caption || ' - ' || s.sapnr display_value
      ,s.sharedservice_id return_value
FROM   sharedservices s, sharedservicelead l
WHERE  (   s.sharedservicelead_id = l.sharedservicelead_id
        OR s.ssldeputy_id = l.sharedservicelead_id
       )
AND    l.username = :app_user
UNION
SELECT s.caption || ' - ' || s.sapnr display_value
      ,s.sharedservice_id return_value
FROM   sharedservices s
WHERE  HTMLDB_UTIL.get_groups_user_belongs_to(:APP_USER) = 'capacitymanagement'
```
See you soon

Ben

variable with sql reuse various clauses
Hello

Is it possible to reuse the same variable with sql different queries in the packages...

Example:

I have a Word to say variable

name of the variable 1): filename

(2) in variable query: select 'emp.txt' of the double

so using the name of this variable in the data store, I'm passing filename dynamically, but I need to change the file name to dept.txt emp.txt missing emp.txt food.

A solution on my side uses a table dump with the file name. more without the use of db tables

Please share views

See you soon,.
Surya
You will then need the help of beanshell java technology. Variable2 take the second query in cooling mode. Now, create a procedure. At the 1st step of technology will be java beanshell with below codes.

<>
String xtr = "#variable2";
@>

Now in ko-> step use variable1 in assign mode

Variable1 =<@=xtr@>

It will certainly work.

Thank you.

ORA-00900 when you use the command COPY with dynamic SQL
Helllo,
I created the following procedure:

create or replace procedure copyTable (pSourceTableOwner IN varchar2
pSourceTableOwnerPasword IN varchar2
pTargetTableOwner IN varchar2
pTableName IN varchar2
pDatabaseLink IN varchar2)
as

vStatement varchar2 (250): = null;

Start

vStatement: = "copy of". pSourceTableOwner | '/' || pSourceTableOwnerPasword | '@' || pDatabaseLink |
"Insert" | pTargetTableOwner | '.' || pTableName | ' using select * from '. pTableName;

immediately run vStatement;

end;
/

The generated command (variable vStatement) looks like this:
"Insert a copy of O_GLCEN/o_glcen@SELLENTW o_jh. "X_PLZ_CD_MERGED_CTIS using select * from X_PLZ_CD_MERGED_CTIS".

When you call this procedure as "exec copyTable ('O_GLCEN', 'o_glcen', 'o_jh', 'X_PLZ_CD_MERGED_CTIS', 'SELLENTW');" the following lifts:

FEHLER in line 1:
ORA-00900: invalid SQL statement
ORA-06512: at "SYSTEMTECHNIK". COPYTABLE", line 20
ORA-06512: at line 1

But when you call the command COPY directly from SQL prompt the statement runs without error.
Is in general not possible to use the dynamic COPY with SQL command? If it is possible does anyone has an idea what I am doing wrong?

Any help will be appreciated...

Rgds
JH
I would like to use something like

vStatement: = ' start in f (select * from ' | pSourceTableOwner |) '.' || pTableName | '@' || pDatabaseLink | Insert loop ') in ' | pTargetTableOwner | '.' || pTableName | "f-values; end loop; end; »
immediately run vStatement;

Family tree in PL SQL

Hello
I need to create a family tree with data below.
ID name relationship
01 John 01
02 Max 01
03 Smith 01
04 Paul 03
05 Sam 03
John
-Max
-Smith
-Paul
-Sam
I've developed a function, if you enter 01 (Paul) ID it will return MAX & SMITH.
Can you please help how to proceed with a pl sql going down until the family name?
I also tried to connect you as below link, but every time I finish with "ORA-30009: not enough memory for operation CONNECT BY.
Representative of the trees in Oracle SQL

Check this box:

WITH T (Id,

Name,

Relationship) AS

(SELECT '01', 'John', '01' FROM DUAL

UNION ALL

SELECT '02', 'Max', '01' FROM DUAL

UNION ALL

SELECT '03', 'Smith', '01' FROM DUAL

UNION ALL

SELECT '04', 'Paul', '03' FROM DUAL

UNION ALL

SELECT '05', 'Sam', '03' FROM DUAL

UNION ALL

SELECT '06', 'New', '06' DOUBLE)

Select lpad (substr (nm, instr (nm, ' /',-1) + 1, length (nm)),)

length (substr (nm, instr (nm, ' /',-1) + 1, length (nm))) +.

instr(nm, '/', -1), ' ') nm

from (SELECT NAME, SYS_CONNECT_BY_PATH (NAME, ' /') nm)

T

Start with the identity card - relationship = 0

CONNECT RELATED NOCYCLE = PRIOR ID)

SQL >

23.

NM

--------------------------------------------------------------------------------

John

Max

Smith

Paul

Sam

New

6 selected lines

SQL >

-----

Ramin Hashimzade

ID	name	relationship
01	John	01
02	Max	01
03	Smith	01
04	Paul	03
05	Sam	03

Building the tree balanced with SQL hierarchical queries

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