How can i make a cursor dynamic?

Question

I have two table summary and staging tables.First time iwill insert all rows from staging to summary.
Summary table will have Values from Staging + Moth_to_date value and YTD values per station by date.
ex:
Staging(A,DT,STN) (10,'02-JULY-2004',001);
(12,'02-JULY-2004',002);
(15,'03-JULY-2004',001);
10,'03-JULY-2004',002);
SUMMARY(A,MTD_A,YTD_A,DT,STN) # LAST ROW
(10,100,1000,'01-JULY-2004',001)
(20,200,2000,'01-JULY-2004',002)
PROBLEM:-
noW I WANT TO UPDATE THE SUMMARY TABLE WITH THE VALUES FROM STAGING TABLE + ADD MTD,YTD VALUES.
EXPECTED RESULTS:
SUMMARY TABLE:-
(10,110,1010,'02-JULY-2004',001)
(15,125,1025,'03-JULY-2004',001)
(12,212,2012,'02-JULY-2004',002)
(10,222,1022,'03-JULY-2004',002)
i WANT A DYNAMIC CURSOR WHICH PICKS THE LAST ROW MTD/YTD FROM SUMMARY TALBE.
EX:- CURSOR SHOULD GET SUMMARY(MTD_A,YTD_A,DT,STN)
CURSOR 1ST TIME --100,1000,'01-JULY-2004',001
200,2000,'01-JULY-2004',002
2ND TIME --110,1010,'02-JULY-2004',001)
(15,125,1025,'03-JULY-2004',001
ETC.
I WANT A CUSOR WHICH PICKS THE LAST ROW VALUES FROM SUMMARY TABLE, SO THAT I CAN INSERT NEW ROW WITH CORRECT VALUES.
WE ARE GOING ON PRODUCTION NEXT WEEK ANY HELP REGARDING THIS WILL BE HIGHTLY APPRECIATED.
U CAN REACH ME ON 409-457-1131

Answer 1

It looks like you would want to join the tables and use analytic functions here
SELECT stag.a,
       sum.mtd_a + SUM( stag.a ) OVER( PARTITION BY stag.stn ORDER BY stag.a ) new_mtd,
       sum.ytd_a + SUM( stag.a ) OVER( PARTITION BY stag.stn ORDER BY stag.a ) new_ytd,
       stag.dt,
       sum.stn
  FROM summary sum,
       staging stag
WHERE sum.stn = stag.stn
         A    NEW_MTD    NEW_YTD DT               STN
        10        110       1010 02-JUL-04          1
        15        125       1025 03-JUL-04          1
        10        210       2010 03-JUL-04          2
        12        222       2022 02-JUL-04          2Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC