Help on Dense Rank Function

Question

Hello All,
Below is the sql i am trying to execute and the Dense Rank function is giving same result for all of the rows, could you please help me where i am doing wrong
SELECT
AMT,
DENSE_RANK() OVER (PARTITION BY AMT ORDER BY AMT DESC) AS DENSE_RANK
FROM
SELECT DISTINCT
SUM(NVL(TRUNC(NET_AMT) * NVL(GLOBAL1_EXCHANGE_RATE,1),0))
OVER (PARTITION BY CUSTOMER_BILL_TO_LOC_WID ORDER BY CUSTOMER_BILL_TO_LOC_WID)
AS AMT
FROM
W_SALES_BOOKING_LINE_F
WHERE
SALES_ORDER_NUM IN ('10612426','10612450','10612477','32649203')
AND
X_MONTH_WID=TO_CHAR(SYSDATE-1,'YYYYMMDD')
)--ORDER BY AMT DESC Result Set:
AMT     DENSE_RANK
0     1
2,855     1
6,706     1
14,265     1

Answer 1

you have "broken" up your resultset (from the inline view) by AMT (PARTITION BY AMT)
and per part, you sort this (one row in each partition, not a whole lot of sorting) ( ORDER BY AMT DESC)
then you assign a ranking based on the sorting action... which yields 1 (DENSE_RANK)
Are you looking for this
SELECT
AMT,
DENSE_RANK() OVER (ORDER BY AMT DESC) AS DENSE_RANK
FROM
SELECT DISTINCT
SUM(NVL(TRUNC(NET_AMT) * NVL(GLOBAL1_EXCHANGE_RATE,1),0))
OVER (PARTITION BY CUSTOMER_BILL_TO_LOC_WID ORDER BY CUSTOMER_BILL_TO_LOC_WID)
AS AMT
FROM
W_SALES_BOOKING_LINE_F
WHERE
SALES_ORDER_NUM IN ('10612426','10612450','10612477','32649203')
AND
X_MONTH_WID=TO_CHAR(SYSDATE-1,'YYYYMMDD')
)--ORDER BY AMT DESC