Combine several values of rank in a line like comma delimeted string

Hello

I have a requirement to combine several values of rank in a line as the comma delimeted string as below

INDEX_NAME COLUMN_NAME POSITION_COLONNE
EMP_EMAIL_UK EMAIL 1
EMP_EMP_ID_PK EMPLOYE_ID 1
EMP_DEPARTMENT_IX DEPARTMENT_ID 1
JOB_ID EMP_JOB_IX 1
EMP_MANAGER_IX MANAGER_ID 1
EMP_NAME_IX LAST_NAME 1
EMP_NAME_IX FIRST_NAME 2
I write in a SQL and the output I need is, for example EMP_NAME_IX LAST_NAME, FIRST_NAME.

I can't write any function as well.

http://www.Oracle-base.com/articles/Misc/StringAggregationTechniques.php

SELECT index_name,
       ltrim(sys_Connect_by_path(column_name, ','), ',') column_names
  FROM (select index_name,
               column_name,
               row_number() over(partition by index_name order by column_position) rn
          from all_ind_columns
         WHERE table_owner = 'HR')
 WHERE connect_by_isleaf = 1
 START WITH rn = 1
CONNECT BY PRIOR rn = rn - 1
       and prior index_name = index_name

Tags: Database

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    I have data as follows:
    CREATE TABLE item_year
(     item_no     CHAR(25)
,     year     CHAR(4)
);

INSERT INTO item_year
VALUES ('item1','1998');
INSERT INTO item_year
VALUES ('item1','2002');
INSERT INTO item_year
VALUES ('item1','2003');
INSERT INTO item_year
VALUES ('item1','2004');
INSERT INTO item_year
VALUES ('item2','1984');
INSERT INTO item_year
VALUES ('item2','1991');
INSERT INTO item_year
VALUES ('item2','2006');
INSERT INTO item_year
VALUES ('item2','2008');
INSERT INTO item_year
VALUES ('item2','2010');
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------------------------------
item1     1998, 2002, 2003, 2004
item2     1984, 1991, 2006, 2008, 2010
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    Hello

    You can do the slightly simpler query by losing the CONNECT BY. In the example that you copied, CONNECT BY was the only way to get the items that should be grouped together. In your case, a simple query will do:

    SELECT     item_no
,     CAST ( MULTISET ( SELECT    year
                        FROM         item_year
                 WHERE         item_no     = all_item_nos.item_no
                 ORDER BY  year
               )
            AS myArrayType
          )          AS years
FROM    (
         SELECT DISTINCT  item_no
         FROM             item_year
     ) all_item_nos
;

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    If you use the PL/SQL, you might consider this approach: write a function that takes an id (like item_no) as an argument and returns a string (the list or results). You probably want several similar functions for the different arguments, tables and columns. If Yes, you can isolate the part that actually built the chain to verify that the results are actually in the allocated space, in a generic function (such as concat_query, below) and to call this generic function to a specific function (such as all_years, below) adapted to a specific situation.
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AS

TYPE     concat_query_cursor_type     IS     REF CURSOR
     RETURN     dual%ROWTYPE;

FUNCTION concat_query
(
     in_cursor          IN     concat_query_cursor_type,
     in_separator_txt     IN     VARCHAR2
)
RETURN     VARCHAR2
;

END     string_agg;
/
SHOW ERRORS

CREATE OR REPLACE PACKAGE BODY string_agg
AS

FUNCTION concat_query
(
     in_cursor          IN     concat_query_cursor_type,
     in_separator_txt     IN     VARCHAR2
)
RETURN     VARCHAR2
IS
     c_txt          VARCHAR2 (4000);
     return_txt     VARCHAR2 (4000) := '';
     return_max_val     INTEGER := 4000;     -- declared size of return_txt
     row_cnt          INTEGER := 0;          -- number of pa records found so far
BEGIN
     LOOP
          FETCH  in_cursor  INTO  c_txt;
          EXIT  WHEN  in_cursor%NOTFOUND;

          IF  row_cnt > 0
          THEN
               c_txt := in_separator_txt || c_txt;
          END IF;

          IF  LENGTH (return_txt) + LENGTH (c_txt) > return_max_val
          THEN
               c_txt := SUBSTR
               (
                    c_txt,
                    1,
                    return_max_val - LENGTH (return_txt)
               );
          END IF;

          return_txt := return_txt || c_txt;

          IF  LENGTH (return_txt) >= return_max_val
          THEN
               EXIT;
          END IF;

          row_cnt := row_cnt + 1;
     END LOOP;
     CLOSE in_cursor;

     RETURN (return_txt);
END  concat_query
;

END     string_agg;
/
SHOW ERRORS

    Here is an example of a specific function using this package:

    CREATE OR REPLACE FUNCTION all_years
(
     in_item_no          IN     item_year.item_no%TYPE
)
RETURN     VARCHAR2
IS
     q_cursor     string_agg.concat_query_cursor_type;
     return_txt     VARCHAR2 (4000);
BEGIN
     OPEN       q_cursor     FOR
     SELECT       year
     FROM       item_year
     WHERE       item_no     = in_item_no
     ORDER BY  year;

     return_txt := string_agg.concat_query
     (
          q_cursor,
          ', '
     );

     RETURN (return_txt);
END  all_years;
/
SHOW ERRORS

    The all_years above is a stand-alone function. You could also just have a function in a package, or string_agg, or another package, if that suits your needs.
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    SELECT     item_no
,     all_years (item_no)     AS years
FROM     (
         SELECT DISTINCT  item_no
         FROM             item_year
     )
;

    You could SELECT DISTINCT in the main query, but it would be less effective.
    Output:

    ITEM_NO                   YEARS
------------------------- ----------------------------------------
item1                     1998, 2002, 2003, 2004
item2                     1984, 1991, 2006, 2008, 2010

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                  e.printStackTrace();
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                  try
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    Thanks for all the cooperation to obtain the desired results.

    Concerning

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