Case to interview several values and unique to different tables return value

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  Hello
  
  I have a variable that has sql statement and it gives several values and I want to use this variable in one of the filter of interface condition to filter the data in the source table (which has millions of records).
  
  some could let me know the best method to achieve this scenario.
  
  Appreciate your help.

  You are right. Yesterday, I don't think in this case where the data could be from a different server. But I completely forgot today.
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  Hello gurus,
  
  Asked in an interview about the difference between primary and unique keys.
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  Two things.
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• [8i] need to combine several values in a column

  I work in 8i...
  
  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');
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  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
  ;
  

  I don't know how to get a simple string (rather than myArrayType) for results without the help of PL/SQL.

  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.
  This is a package that contains the generic function:

  CREATE OR REPLACE PACKAGE     string_agg
  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.
  As you can see, the specific function is quite trivial. You could probably do something with dyanamic SQL, where you write another function, with the text of a query as a string argument, and it calls concat_query and returns this value.

  Here is an example of using the all_years function in a query:

  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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