Data_length of number data type

when I checked for the columns with data type as number in dba_tab_cols it is showing 22 for all the columns irrespective of the precision and scale. why is it so?
also can you tell what data length exactly means?
Edited by: user12288160 on May 19, 2010 3:04 AM

Hi tom,
I am doing database sizeing. I am expecting that one of my table will have 50,000,000 records in
future(say within 6 month). That table has composite primary key(5 columns). All the columns are
NUMBER data type. In All_tab_column I could see the data length is always 22. So I tried to
decrease the length( Number(10)). Then also its saying data length is 22. But I Know that I can't
enter data in this field more than 10 digits. So In this case it should be 12. But why its showing
22(Data_length field in All_tab_columns).
My question is, for my sizeing calculation, should I take this length 12 or 22?.
Thanks
Followup August 12, 2004 - 9am Central time zone:
that is the max length -- numbers are stored as varying length character strings.
Source: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1619552483055
REgards
Asif Kabir

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Please, observe the following example:
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col1 NUMBER (6, 2),
col2 NUMBER (6, -1),
col3 NUMBER (6, -2),
col4 NUMBER (6, -3)
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   1000,89           1000           1000     1000
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     56,89             60            100     0
     20,89             20              0     0
     49,89             50              0     0
     50,89             50            100     0
    501,89            500            500     1000
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--Global variables--
gvar_mapviewer_host VARCHAR2(56) := 'http://tiger.iso.port.ac.uk:7785/mapviewer/omserver';
gvar_proc_host VARCHAR2(56) := 'http://tiger.iso.port.ac.uk:7785/www/geg50160';
gvar_xml_request VARCHAR2(100) :='?xml_request=<?xml version="1.0" standalone="yes"?>';
--Main calling programming--
PROCEDURE MAPS AS
empty owa_util.ident_arr;
BEGIN
PROCCHECKLIST (empty);
END MAPS;
--create checkboxes--
PROCEDURE PROCCHECKLIST
(par_check_list IN OUT owa_util.ident_arr
AS
   CURSOR cur_map_list IS
    SELECT MT.map_title,
           MI.map_id,
           OMSN.map_sheet_number_id,
           WRMF.web_raster_map_id
     FROM MAP_TITLE MT,
          MAP_INFO MI,
          MAP_SHEET_NUMBER OMSN,
          WEB_RASTER_MAP_FILE WRMF
      WHERE MI.map_title_id = MT.map_title_id
      AND   MI.map_id = OMSN.map_id
      AND   WRMF.map_id = MI.map_id
      AND   WRMF.map_sheet_number_id = OMSN.map_sheet_number_id;
BEGIN
htp.htmlOpen;
htp.headOpen;
htp.headClose;
htp.bodyOpen;
htp.print('<FORM METHOD = "post"
                 ACTION = "'||gvar_proc_host||'.mappackage.procdisplay">');
    htp.print('<FIELDSET>
                 <LEGEND> Select the maps you wish to display </LEGEND>');
FOR var_map_list IN cur_map_list
LOOP
htp.print('       <UL>
                   <LI>
                    <LABEL FOR = "WRMF'||
                                  var_map_list.web_raster_map_id||'">
                     <INPUT type = "checkbox"
                            id = "WRMFB'||
                                  var_map_list.web_raster_map_id||'"
                            name = "maplist"
                            CHECKED = "' ||
                                       par_map_list ||'"
                            value = "'||var_map_list.web_raster_map_id||'"
                            />
                             Map title: '|| var_map_list.map_title||'<BR>
                             Sheet number: '||var_map_list.map_sheet_number||'');
                    htp.print('</LABEL>
                   </LI>
                  </UL>');
    END LOOP;
     htp.print('</FIELDSET>');
     htp.print('<p>
                 <INPUT TYPE = "submit"
                        VALUE = "Display selected maps" />
                  </FORM>');
htp.bodyClose;
END PROCCHECKLIST;
---PROCDISPLAY PROCEDURE---
PROCEDURE PROCDISPLAY (maplist IN OUT owa_util.ident_arr)
IS
BEGIN
FOR n IN 1..maplist.COUNT
LOOP
htp.print('Checkbox value i.e. var_map_list.web_raster_map_id is: ' ||maplist(n)||'
<P>');
END LOOP;
END PROCDISPLAY;
END MAPSITE;Kind regards
Tim

Dynamic ORDER BY clause - Possible different data types...

I have a lexical parameter in my ORDER BY clause:
ORDER BY &P_ORDER_BY
My problem is that I have to designate this parameter as either a date, character or number, but the user defined column being ordered by could be any one of these. When I designate the parameter as a character type, and a number data type column is chosen, it orders by that value, but it orders it as though it were a character field, referencing the initial digit and not the overall numeric value. If I choose a number parameter type, and a character value is chosen, I get an invalid number error, and so on.
Anyone have any ideas how I can do this?

Okay, now we're on the right track. The lexical parameter I'm using allows the user to choose from a list of the columns being retrieved in the SELECT statement, so it will always be one that's in there, as you said. Now, since I don't know which one it's going to be, I can't just make all but one of them 'None' for the break order, BUT, what I intended to do was to add a column to the SELECT statement that would always return the column they chose, and I could put the break order on that column, leaving all the rest 'None'. However, in the past, this has created 2 problems for me.
1.) As I mentioned in the first post, the column being returned could have a data type of character, number or date, but the parameter must be designated as only one of these. So, if the user chooses to order by a column having a value with a data type other than what the parameter is designated to be, then I get errors, it doesn't order correctly, etc...
2.) This is the strange, but anytime I've marked all but one column as 'None' for the Break Order, my child data doesn't always stay with the parent. For example, the report is on an IT request database. The 'group fields' consist of data elements that are demographic info.of a request (requester, date requested, description, etc...), and the details for each request list out the comments that have been made in the system for that request. The problem I'm seeing when I set the break orders this way is that each request displays not only its own comments, but it lists out comments for other requests as well, and there doesn't seem to be any logic to which request's comments it lists in addition to its own, it just lists as many as will fit on the page...I don't know if I explained that very well, but that's what's happening.
Does any of that make sense? Any ideas?

Data_length of number data type

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