Creating Group ID from SUM Limit - response (8) by saraider99

I ended up using a suggestion from the guys over at stack overflow.
First create a table that has the group id and the upper and lower limits of each bucket.

-- create the first entry for the recursive query
INSERT  TMP_WORK_DB.GRP_NBRS VALUES (0,1,0,2000000);

INSERT TMP_WORK_DB.GRP_NBRS (GRP_NBR,LOWER_LIMIT, UPPER_LIMIT)
WITH RECURSIVE GRP_RECRSV (GRP_NBR, LOWER_LIMIT, UPPER_LIMIT) 
AS (
SELECT 
    1 AS GRP_NBR
,   LOWER_LIMIT
,   UPPER_LIMIT
FROM TMP_WORK_DB.GRP_NBRS
UNION ALL
SELECT
    GRP_NBR + 1 
,   LOWER_LIMIT + 2000000 -- set the interval to 2 million
,   UPPER_LIMIT + 2000000 -- can be adjusted as needed
FROM GRP_RECRSV
WHERE GRP_NBR < 120 -- needed a limit so that it would not be endless
)
SELECT * FROM GRP_RECRSV
;

Then use a simply WHERE BETWEEN on the data to determine which GROUP ID to assign.

-- delete the first entry because it was duplicated
DELETE FROM TMP_WORK_DB.GRP_NBRS WHERE GRP_NBR = 0;

-- set grp nbr using the limits table
INSERT TMP_WORK_DB.PROD_LIST_GRP
WITH NUMOFPRODS (PROD_NAME,QTY,RUNNING) AS
(
    SELECT 
        PROD_NAME
    ,   COUNT(DISTINCT PROD_ID) AS QTY
    ,   SUM(QTY) OVER (ORDER BY QTY ROWS UNBOUNDED PRECEDING) RUNNING
    FROM TMP_WORK_DB.PROD_LIST
    GROUP BY 1
)
SELECT 
    PROD_NAME
,   QTY
,   RUNNING
,   GRP_NBR
FROM NUMOFPRODS a
JOIN TMP_WORK_DB.GRP_NBRS b ON RUNNING BETWEEN LOWER_LIMIT AND UPPER_LIMIT
;