select rows into a list using DB2 SQL

Are you simply looking to put the results in ascending order?

How about this?

select m.emp_no
from   MyTable m
order by m.emp_no

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Hi Dave,

Betcha this is a columns to rows issue.  :)



Hi Ewang,

Are you looking to put all of the items on a single line?


Kent

Yes, I like to  put all of the items (rows) on a single line.  Basically, I like to put all the rows (single column) into one row seperated by comma.  Thanks.

I looked at https://www.experts-exchange.com/questions/24110747/how-to-convert-multiple-rows-into-a-single-column-with-comma-separated-value.html .  I see the following.  But, I cannot finish the following sample code.  Maybe the author was trying to write a function, but my DB2 skill is not as advanced.  Please help.

--
--  Create a test table and sample data
--
CREATE TABLE t (
  id integer not null generated by default as identity,
  st varchar (2));
INSERT INTO t (st) VALUES ('CA');
INSERT INTO t (st) VALUES ('NJ');
INSERT INTO t (st) VALUES ('NY');
INSERT INTO t (st) VALUES ('PA');
--
--  Build the string
--
with tt (id, v, current, final)
as
(
 
  SELECT id, id, st, cast (st as varchar (100))
  from t t1
 
  union all
 
  select t1.id, t2.id, t1.st, cast (t2.final || ',' || t1.st as varchar (100))
  from t t1, tt t2
  where t2.id < t1.id
  and locate (t1.st, t2.final) = 0
)
select * from tt;
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Hi ewang,

The SQL start with the word 'with' actually builds the string.  The CREATE TABLE and INSERT statements generate a test case to demonstrate the recursive SQL.

Post your table definition (at least the relevent parts) and your rules for selecting items to be on the same line.  I'll be glad to put the SQL together for you.


Kent

Here is the table:

CREATE TABLE t (
  id integer not null generated by default as identity,
  st varchar (2));
INSERT INTO t (st) VALUES ('CA');
INSERT INTO t (st) VALUES ('NJ');
INSERT INTO t (st) VALUES ('NY');
INSERT INTO t (st) VALUES ('PA');
.
How to have a SQL or stored procedure to have the following output?  Can the recursive  SQL be part of the stored procedure?
CA, NJ, NY, PA

Hi ewang,

I'm confused.  That's the table that I used in the example.

So what's the question?


Kent

The problem is the following select returns more rows than I needed.  Another problem is if can I put the recursive SELECT into a store procedure?  Thanks.
select * from tt;

Here is the stored procedure I wrote using table t.  Works fine.  The only problem is to fin the last row and then LEAVE fetch_loop.  How to find the last row ?  

CREATE PROCEDURE LOOP_UNTIL_last_row(OUT tstring  vARCHAR(1000)  )
   LANGUAGE SQL
   BEGIN
      DECLARE v_st VARCHAR(15);
--declare v_counter  integer default 0;
declare v_tstring VARCHAR(1000) default '';
      DECLARE c1 CURSOR FOR
         SELECT st FROM t;
      --DECLARE EXIT HANDLER FOR NOT FOUND
        -- SET counter = -1;
      OPEN c1;
      fetch_loop:
      LOOP
        FETCH c1 INTO v_st;
        IF v_st = 'NY' THEN
           LEAVE fetch_loop;
        END IF;
      --  SET v_counter = v_counter + 1;
set v_tstring = v_tstring ||','||v_st;
      END LOOP fetch_loop;
      SET tstring= substr(v_tstring,2);
      CLOSE c1;
   END