One column one row w/ separator to be hierarchical columns

Question

Dear Gurus,
I want to present the "+one column/one row data+"
F:\JDeveloper\Tut\TIJ4-code\generics\watercolors\Watercolors.javaas this follow:
id               parent_id
Watercolors.java     watercolors
watercolors          generics
generics          TIJ4-code
TIJ4-code          Tut
Tut               JDeveloper
JDeveloper          F:Id better using an sql rather than pl/sql.
regards,

Answer 1

I think you'd struggle to do this in SQL alone, unless you use some fancy MODEL clause or Michaels can come up with some nifty XML solution. I would probably go with some PL/SQL as a pipelined function...
SQL> create table treedata as
  2  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Adding Window Event Listener. Working with MDI.swf' as cp from dual union all
  3  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating Finger Icon.swf' from dual union all
  4  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating Key Icon.swf' from dual union all
  5  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class Containing Information on Fingers.swf' from dual union all
  6  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class Handling Shift Press.swf' from dual union all
  7  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class KBLayout\Creating the Class KBLayout (Part 1).swf' from dual union all
  8  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class KBLayout\Creating the Class KBLayout (Part 2).swf' from dual union all
  9  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class KeyCode.swf' from dual union all
10  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class KeyIcon\Creating the Class KeyIcon (Part 1).swf' from dual union all
11  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class KeyIcon\Creating the Class KeyIcon (Part 2).swf' from dual union all
12  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class for Key Systemization .swf' from dual union all
13  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating Supplementary Classes\Creating the Class for Saving Information on Keys.swf' from dual union all
14  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Creating the Main Window (the Class MainWindow).swf' from dual union all
15  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Class Constructor.swf' from dual union all
16  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Creating Methods Responsible for Icon Fill.swf' from dual union all
17  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Creating Methods Responsible for Icon Highlight\Creating Methods Responsible for Icon Highlight (Part 1).swf' from dual union all
18  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Creating Methods Responsible for Icon Highlight\Creating Methods Responsible for Icon Highlight (Part 2).swf' from dual union all
19  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Defining Some Static Variables\Defining Some Static Variables (Part 1).swf' from dual union all
20  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Defining Some Static Variables\Defining Some Static Variables (Part 2).swf' from dual union all
21  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Highlighting Icons.swf' from dual union all
22  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Overriding the Method run.swf' from dual union all
23  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Overriding the Method setVisible.swf' from dual union all
24  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\Registering Keyboard in the Main Window of Application .swf' from dual union all
25  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\KeyboardGUI\The Methods new_icon and new_fingericon.swf' from dual union all
26  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Adding Keyboard Listener to the Application.swf' from dual union all
27  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Creating Methods to Test the Efficiency of the User''s work.swf' from dual union all
28  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Creating the class ExerciseGUI.swf' from dual union all
29  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Creating the class Lessons and Working with It in the Class ExerciseGUI.swf' from dual union all
30  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Handling Pressed Keys.swf' from dual union all
31  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Improving Graphical Interface of the Class ExerciseGUI.swf' from dual union all
32  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Setting Position and the Sizes of the Main Window.swf' from dual union all
33  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Statistics.swf' from dual union all
34  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Working with Graphical Interface of the Class ExerciseGUI.swf' from dual union all
35  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\The Class ExerciseGUI\Working with Keyboard Events.swf' from dual union all
36  select 'F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\Working with Main Window Menu. Positioning the Main Window.swf' from dual
37  /
Table created.
SQL>
SQL>
SQL>
SQL> CREATE OR REPLACE TYPE pth IS TABLE OF VARCHAR2(32767);
  2  /
Type created.
SQL>
SQL> CREATE OR REPLACE FUNCTION tree RETURN pth PIPELINED IS
  2    l_maxlen      NUMBER;
  3    l_parent_path VARCHAR2(255);
  4    type t_output is table of varchar2(32767) index by pls_integer;
  5    l_output      t_output;
  6    l_cnt         NUMBER := 0;
  7    PROCEDURE show_children(p_path IN VARCHAR2, p_lvl IN NUMBER, p_tree IN VARCHAR2) IS
  8      l_ch_path_cnt number;
  9      CURSOR cur_children_elements IS -- non path children
10        select replace(cp,p_path) as ch
11        from   treedata
12        where  instr(replace(cp,p_path),'\') = 0
13        order by 1;
14      CURSOR cur_children_paths IS -- path children
15        select pth
16              ,row_number() over (order by pth) as rn
17              ,count(*) over () as cnt
18        from (
19              select distinct substr(replace(cp,p_path),1,instr(replace(cp,p_path),'\')) as pth
20              from   treedata
21              where  instr(cp,p_path) > 0
22              and    instr(replace(cp,p_path),'\') > 0
23              order by 1
24             );
25    BEGIN
26      select count(*)
27      into   l_ch_path_cnt
28      from   treedata
29      where  instr(cp,p_path) > 0
30      and    instr(replace(cp,p_path),'\') > 0;
31      for c in cur_children_elements
32      loop
33        l_cnt := l_cnt + 1;
34        if l_ch_path_cnt = 0 then
35          l_output(l_cnt) := replace(replace(substr(p_tree,1,length(p_tree)-2)||'  ','+',' '),'-',' ')||'  '||c.ch;
36        else
37          l_output(l_cnt) := replace(replace(p_tree,'+',' '),'-',' ')||'  '||c.ch;
38        end if;
39      end loop;
40      if l_ch_path_cnt = 0 then
41        l_cnt := l_cnt + 1;
42        l_output(l_cnt) := substr(p_tree,1,length(p_tree)-2);
43      else
44        l_cnt := l_cnt + 1;
45        l_output(l_cnt) := p_tree;
46      end if;
47      for p in cur_children_paths
48      loop
49        if p.rn != p.cnt then
50          l_cnt := l_cnt + 1;
51          l_output(l_cnt) := substr(p_tree,1,length(p_tree)-2)||'+-'||substr(p.pth,1,length(p.pth)-1);
52          show_children(p_path||p.pth, p_lvl+1, substr(p_tree,1,length(p_tree)-2)||'| | ');
53        else
54          l_cnt := l_cnt + 1;
55          l_output(l_cnt) := substr(p_tree,1,length(p_tree)-2)||'\-'||substr(p.pth,1,length(p.pth)-1);
56          show_children(p_path||p.pth, p_lvl+1, substr(p_tree,1,length(p_tree)-2)||'    ');
57        end if;
58      end loop;
59    END;
60  BEGIN
61    -- first display the common parent path
62    select max(length(txt)) as max_ln
63    into   l_maxlen
64    from (
65          select substr(cp,1,rn) as txt
66          from   treedata, (select rownum rn from dual connect by rownum <= 255)
67          group by substr(cp,1,rn)
68          having count(*) = (select count(*) from treedata)
69         );
70    select substr(cp,1,l_maxlen)
71    into   l_parent_path
72    from   treedata
73    where  rownum = 1;
74    PIPE ROW(l_parent_path);
75    -- now recurse the data
76    show_children(l_parent_path, 1, '| ');
77    for i IN 1..l_cnt
78    loop
79      PIPE ROW(l_output(i));
80    end loop;
81    RETURN;
82  END tree;
83  /
Function created.
SQL>
SQL> select * from table(tree);
COLUMN_VALUE
F:\Teach_Pro_JAVA\Teach_Pro_JAVA\Teachpro\Working Over the Project\
|   Adding Window Event Listener. Working with MDI.swf
|   Creating the Main Window (the Class MainWindow).swf
|   Working with Main Window Menu. Positioning the Main Window.swf
|
+-Creating Supplementary Classes
| |   Creating Finger Icon.swf
| |   Creating Key Icon.swf
| |   Creating the Class Containing Information on Fingers.swf
| |   Creating the Class Handling Shift Press.swf
| |   Creating the Class KeyCode.swf
| |   Creating the Class for Key Systemization .swf
| |   Creating the Class for Saving Information on Keys.swf
| |
| +-Creating the Class KBLayout
| |     Creating the Class KBLayout (Part 1).swf
| |     Creating the Class KBLayout (Part 2).swf
| |
| \-Creating the Class KeyIcon
|       Creating the Class KeyIcon (Part 1).swf
|       Creating the Class KeyIcon (Part 2).swf
|
+-KeyboardGUI
| |   Class Constructor.swf
| |   Creating Methods Responsible for Icon Fill.swf
| |   Highlighting Icons.swf
| |   Overriding the Method run.swf
| |   Overriding the Method setVisible.swf
| |   Registering Keyboard in the Main Window of Application .swf
| |   The Methods new_icon and new_fingericon.swf
| |
| +-Creating Methods Responsible for Icon Highlight
| |     Creating Methods Responsible for Icon Highlight (Part 1).swf
| |     Creating Methods Responsible for Icon Highlight (Part 2).swf
| |
| \-Defining Some Static Variables
|       Defining Some Static Variables (Part 1).swf
|       Defining Some Static Variables (Part 2).swf
|
\-The Class ExerciseGUI
      Adding Keyboard Listener to the Application.swf
      Creating Methods to Test the Efficiency of the User's work.swf
      Creating the class ExerciseGUI.swf
      Creating the class Lessons and Working with It in the Class ExerciseGUI.swf
      Handling Pressed Keys.swf
      Improving Graphical Interface of the Class ExerciseGUI.swf
      Setting Position and the Sizes of the Main Window.swf
      Statistics.swf
      Working with Graphical Interface of the Class ExerciseGUI.swf
      Working with Keyboard Events.swf
51 rows selected.
SQL>