Distinct Values on column ov NVARCHAR2 Type

Hi,
I have a Table with a Nvarchar2(255) Column on a 10.2.0.4 Database.
I collected statistics on the table on different ways, with and without histograms. I know the table has about 65.000 distinct values, but dba_tab_col_statistics always shows 10 Rows.
For a test I created a new column of type varchar2(255) and copied the data from the nvarchar2 in the varchar2 column. Again i collected statistics, and for the varchar2 column it shows the correct value.
any ideas ?
Regards
PK
Here some more data:
select count(distinct(REPOSID_XMETA)) from tmp;COUNT(DISTINCT(REPOSID_XMETA))
63933
alter table tmp add tmp_col varchar2(255);Table altered.
>desc tmp
Name Null? Type
REPOSID_XMETA NVARCHAR2(255)
TMP_COL VARCHAR2(255)
update tmp set tmp_col = REPOSID_XMETA;63933 rows updated.
commit;Commit complete.
create index tmp_index1 on tmp (REPOSID_XMETA);Index created.
create index tmp_index2 on tmp (tmp_col);Index created.
begin
dbms_stats.gather_table_stats(
ownname=> 'SYS',
tabname=> 'TMP' ,
estimate_percent=> null,
cascade=> TRUE,
degree=> 4,
no_invalidate=> FALSE,
granularity=> 'AUTO',
method_opt=> 'FOR ALL INDEXED COLUMNS');
end; /
select COLUMN_NAME, NUM_DISTINCT, DENSITY, NUM_NULLS, NUM_BUCKETS from dba_tab_col_statistics where table_name = 'TMP2';Column Distinct
Name Values Density NUM_NULLS NUM_BUCKETS
REPOSID_XMETA 10 0 0 10
TMP_COL 63,933 0 0 75
Edited by: user1131374 on Jul 1, 2011 5:27 AM

Sorry, wrong cut and paste. TMP2 is a copy of TMP. Nethertheless, same query on TMP shows same results:
select COLUMN_NAME, NUM_DISTINCT, DENSITY, NUM_NULLS, NUM_BUCKETS from dba_tab_col_statistics where table_name = 'TMP';COLUMN_NAME NUM_DISTINCT DENSITY NUM_NULLS NUM_BUCKETS
REPOSID_XMETA 10 7.8207E-06 0 10
TMP_COL 63933 .000015641 0 75
regards
Paolo

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Hi,
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========================================================================
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Kalman Toth Database & OLAP Architect
SQL Server 2014 Database Design
New Book / Kindle: Beginner Database Design & SQL Programming Using Microsoft SQL Server 2014

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SELECT "CODE COMBINATIONS"."LINE AC PERIOD" FROM INVOICE_PAYMENTS
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I have a table with three columns and I would like to display distinct values in each column. Could any one please help me to get the output.
col1     col2     col3
====     ====     ====
a     1     x
a     2     y
a     3      z
a     4      u
b     5      v
b     6      x
b     7      x
b     9      x
b     10     y
b     11     y
b     12     y
b     13     y
b     14     x
b     15     y
b     16     z
b     17     u
b     18     v
b     19     x
b     20     x
c     21     x
c     22     y
c     23     y
c     24     y
c     25     y
c     26     x
c     27     y
c     28     z
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====     ====     ====
a     1     x
b     2     y
c     3     z
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     6
     7
     9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
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but the only drawback - you need to know the column, comprising the biggest amount of distinct values beforehand.No. There is no any difference in which column will be chosen as "based".
For demo purposes I've added extra row number column to show full generality and symmetry of the approach:
exec dbms_random.seed(0)
with t as ( select chr(ascii('a') + dbms_random.value(0, 3)) as c1,
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                        then last_value(c1) over (order by rn1 range between abs(rn1 - rn) preceding
                                                                         and abs(rn1 - rn) preceding)
                        else last_value(c1) over (order by rn1 range between abs(rn - rn1) following
                                                                         and abs(rn - rn1) following)
                   end as c1,
                   case when rn2 > rn
                        then last_value(c2) over (order by rn2 range between abs(rn2 - rn) preceding
                                                                         and abs(rn2 - rn) preceding)
                        else last_value(c2) over (order by rn2 range between abs(rn - rn2) following
                                                                         and abs(rn - rn2) following)
                   end as c2,
                   case when rn3 > rn
                        then last_value(c3) over (order by rn3 range between abs(rn3 - rn) preceding
                                                                         and abs(rn3 - rn) preceding)
                        else last_value(c3) over (order by rn3 range between abs(rn - rn3) following
                                                                         and abs(rn - rn3) following)
                   end as c3
              from tt2
select c1, c2, c3 from tt3
where c1 || c2 || c3 is not null
order by c1, c2, c3
C1            C2 C3
a              1 u
b              3 v
c              4 w
               5 x
               7 y
               8 z
               9
              11
              13
              15
              16
              17
              19
13 rows selected.P.S. Thanks to [url http://www.sql.ru/forum/actualthread.aspx?bid=3&tid=482506&hl=over+range#4785373]Vladimir Sitnikov for the demo of the approach.

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SQL> r
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3 v_type t_type;
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9* end;
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I have posted this question on the Toplink forum and did get the suggestion of Doug Clarke to use a ReportQuery instead of a ReadAllObjects query, but it's still not clear to me where and what I should do.
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This discussion is being followed up on at Re: getting a list of distinct values

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variable5 = B.
variable6 = D, C.
variable7 = D, C.
Does the task will be easier, if the number of parsed rows is known (e.g. 3 as in our case)?
Edited by: 942736 on 02.10.2012 17:17

You missed your db-version. Please give the result from
select * from v$version;When you are on 11.2 you can try this (will not work with 10.x):
with yourtable as
select 1 id, 'A' col1, 'N' col2, 'B' col3, 'C' col4 ,'N' col5, 'D' col6 ,'N' col7 from dual union all
select 2,'N','N','A','B','C','D','N' from dual union all
select 3,'N','A','B','N','N','C','D' from dual union all
select 4,'N','N','A','N','B','C','D' from dual union all
select 5,'N','N','A','N','B','N','C' from dual
select
(select listagg(col1,',') within group (order by id)||'.' from (select distinct col1, min(id) over (partition by col1 order by id) id from yourtable where id in (1,3,5))) v1,
(select listagg(col2,',') within group (order by id)||'.' from (select distinct col2, min(id) over (partition by col2 order by id) id from yourtable where id in (1,3,5))) v2,
(select listagg(col3,',') within group (order by id)||'.' from (select distinct col3, min(id) over (partition by col3 order by id) id from yourtable where id in (1,3,5))) v3,
(select listagg(col4,',') within group (order by id)||'.' from (select distinct col4, min(id) over (partition by col4 order by id) id from yourtable where id in (1,3,5))) v4,
(select listagg(col5,',') within group (order by id)||'.' from (select distinct col5, min(id) over (partition by col5 order by id) id from yourtable where id in (1,3,5))) v5,
(select listagg(col6,',') within group (order by id)||'.' from (select distinct col6, min(id) over (partition by col6 order by id) id from yourtable where id in (1,3,5))) v6,
(select listagg(col7,',') within group (order by id)||'.' from (select distinct col7, min(id) over (partition by col7 order by id) id from yourtable where id in (1,3,5))) v7
from dual;Output with 11.2 is:
V1      V2      V3      V4      V5      V6      V7
A,N.     N,A.     B,A.     C,N.     N,B.     D,C,N.     N,D,C.@ranit B: You missed, that the OP said that only rows 1,3 and 5 shall be used.
Edited by: hm on 01.10.2012 23:09

How to get distinct values from a list and display in a ListView webpart.

Hi,
I have a requirement in which I need to pull unique/distinct values from a custom list and then display it via a listview webpart. Can any one suggest how this can be done.
If possible please share the CAMEL query to fetch distinct values from a custom list.
Thanks,
Ankit

Hi Ankit,
Is there any particular reason that the values need to be shown in a list view web part? Are you going to use that web part for filtering via web part connections?
I ask because the enterprise site collection features include the SharePoint List Filter web part, which may accomplish what you're looking for.
If you just need to display the values in a grid view, you might have more luck with the JavaScript Client Object Model. Try putting the following in a text file:
<style>
.CustomTableClass{display:table;table-layout:fixed}
.CustomRowClass{display:table-row;}
</style>
<div id="distinct_values_div" class="CustomTableClass">
<img src="/_layouts/loading.gif" />
</div>
<script language="JavaScript" type="text/JavaScript">
var siteUrl = '/sitecollection/web'; //use the actual subsite URL here
var listName = 'mylist'; // use the actual list name here
var field = "Title" // use the actual field you want to display here
var divToUpdate = document.getElementById("distinct_values_div");
var rowClass = "CustomRowClass";
ExecuteOrDelayUntilScriptLoaded(function(){
var clientContext = new SP.ClientContext(siteUrl);
var web = clientContext.get_web();
var lists = web.get_lists();
var list = lists.getByTitle(listName);
var camlQuery = new SP.CamlQuery();
camlQuery.set_viewXml('<View><Query></Query><RowLimit>500</RowLimit></View>');
this.collListItem = list.getItems(camlQuery);
clientContext.load(collListItem,"Include ("+field+")");
clientContext.executeQueryAsync(
Function.createDelegate(this, this.onQuerySucceeded),
Function.createDelegate(this, this.onQueryFailed));
},"sp.js");
function onQueryFailed(sender, args){
divToUpdate.innerHTML = 'Unable to retrieve values: '+args.get_message());
function onQuerySucceeded(sender, args){
var allValues = [];
var listItemEnumerator = collListItem.getEnumerator();
divToUpdate.innerHTML = "";
while(listItemEnumerator.moveNext()){
var listItem = listItemEnumerator.get_current();
if(!containsString(allValues,listItem.get_item(field)){
var value = listItem.get_item(field);
allValues.push(value);
var newDiv = document.createElement("div");
newDiv.className = rowClass;
newDiv.innerHTML = value;
divToUpdate.appendChild(newDiv);
function containsString(strArray, text){
var contains = false;
for (var i=0; i<strArray.length; i++){
if(strArray[i]==text){contains = true; break;}
return contains;
</script>
Upload the text file to a library on the site, then add a content editor web part to a page where you want the distinct values to appear. In the content editor web part's properties, edit the Content Link so that it links directly to the text file. This
will cause the JavaScript to run on the page.

Get distinct values from a coma seperated string variable

Hi ,
I am getting an comma seperated string as in parameter, now i want to get the distinct values from that string and will use those values to pass it to a query.
any help

try this:
sorry about the messiness - it's just quickly copied from some badly formatted code....
TYPE T_FieldArray IS TABLE OF varchar2(255) INDEX BY BINARY_INTEGER;
function SPLIT_CSV_FIELDS (
p_Input_Str in varchar2,
p_Delimiter in varchar2,
p_Quote_Char in varchar2)
return t_fieldarray is
v_FieldArray T_FieldArray;
v_input_str varchar2(4000);
v_field_str varchar2(255);
v_pos number;
e number := 0;
v_delim_str varchar2(3);
cur_pos number;
begin
loop
-- find each delimiter char in string
v_pos := INSTR(v_input_str, p_Delimiter);
-- each time delimiter char is found
if v_pos > 0 then
-- current field value is current string to position prior to delimiter char
v_field_str := UPPER(SUBSTR(v_input_str, 1, v_pos - 1));
-- remove quote char from end of field (if any)
v_field_str := TRIM(TRANSLATE(v_field_str, NVL(p_Quote_Char, p_Delimiter), ' '));
-- increment element number
e := e + 1;
-- get remainder of input string to check
v_input_str := SUBSTR(v_input_str, v_pos + 1, LENGTH(v_input_str) - v_pos);
v_FieldArray(e) := v_field_str;
else
-- increment element number
e := e + 1;
-- last field value is what's left of input string less quote char (if any)
v_field_str := TRIM(TRANSLATE(UPPER(v_input_str), NVL(p_Quote_Char, p_Delimiter), ' '));
v_FieldArray(e) := v_field_str;
exit;
end if;
end loop;
return v_FieldArray;
end;

Distinct Values on column ov NVARCHAR2 Type

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