Query help , calculating Cummulative totals

Question

Hi,
I have a table data_set in which we have the income amounts on month to month basis. I want to update the same table to populate the cummulative total fields for the current month's income + previous months cummulative total. Below is the sample data.
I am using 10.2.0.1.0 ( 10g) and want to write an update statement to update the fields.
with data_Set as(
select '201001' month, '1000' income_amt, '1000' net_income_amt, null cumulative_income_Amt, null cumulative_net_income_amt from dual union all
select '201002' month, '1100' income_amt, '1000' net_income_amt,null,null from dual union all
select '201003' month, '1200' income_amt, '1000' net_income_amt,null,null from dual
) select * from data_SetWrite an update statement so the table looks like below
with data_set as (
select '201001' month, '1000' income_amt, 1000  cumulative_income_amt, '1000' net_income_amt, 1000 cumulative_net_income_amt from dual union all
select '201002' month, '1100' , 2100,   '1000' , 2000 from dual union all
select '201003' month, '1200' , 3300,   '1000' , 3000 from dual
) select * from data_setEdited by: user527060 on Oct 29, 2010 12:03 PM
Edited by: user527060 on Oct 29, 2010 12:04 PM

Answer 1

/* Formatted on 10/29/2010 3:18:42 PM (QP5 v5.149.1003.31008) */
WITH data_Set AS (SELECT '201001' month,
                         '1000' income_amt,
                         '1000' net_income_amt,
                         NULL cumulative_income_Amt,
                         NULL cumulative_net_income_amt
                    FROM DUAL
                  UNION ALL
                  SELECT '201002' month,
                         '1100' income_amt,
                         '1000' net_income_amt,
                         NULL,
                         NULL
                    FROM DUAL
                  UNION ALL
                  SELECT '201003' month,
                         '1200' income_amt,
                         '1000' net_income_amt,
                         NULL,
                         NULL
                    FROM DUAL)
SELECT month,
       income_amt,
       SUM (income_amt) OVER (ORDER BY month) cumulative_income_amt,
       net_income_amt,
       SUM (net_income_amt) OVER (ORDER BY month) cumulative_net_income_amt
  FROM data_Set;
MONTH,INCOME_AMT,CUMULATIVE_INCOME_AMT,NET_INCOME_AMT,CUMULATIVE_NET_INCOME_AMT
201001,1000,1000,1000,1000
201002,1100,2100,1000,2000
201003,1200,3300,1000,3000sorry I originally missed the part where you wanted to update here it is with merge
/* Formatted on 10/29/2010 3:26:26 PM (QP5 v5.149.1003.31008) */
MERGE INTO data_set a
     USING (SELECT month,
                   income_amt,
                   SUM (income_amt) OVER (ORDER BY month)
                      cumulative_income_amt,
                   net_income_amt,
                   SUM (net_income_amt) OVER (ORDER BY month)
                      cumulative_net_income_amt
              FROM data_Set) b
        ON (a.month = b.month AND a.income_amt = b.income_amt and a.net_income_amt = b.net_income_amt)
WHEN MATCHED
THEN
   UPDATE SET
      a.cumalative_income_amt = b.cumulative_income_amt,
      a.cumulative_net_income_amt = b.cumulative_net_income_amtEdited by: pollywog on Oct 29, 2010 3:26 PM
Edited by: pollywog on Oct 29, 2010 3:29 PM