Update/insert with a select statment?

Question

helo,
i have this select statement:
SELECT CLAIM_NO, SUM (LPA_AMT)
FROM LPA_CREDHIST_RCA
GROUP BY CLAIM_NO
And i want to update this field LPA_CLAIM.TOTAL_AMT_PAID with the sum(LPA_AMT)
from above.
the join is lpa_credhist_rca.claim_no = lpa_claim.claim_no.
How do i do this??

Answer 1

With this code, you avoid to scan two time the table lpa_credhist_rca and to update all recod of the lpa_claim table.
Regards Salim
MERGE INTO lpa_claim lc
   USING (SELECT claim_no, SUM (lpa_amt) OVER (PARTITION BY 1) total
            FROM lpa_credhist_rca) lcr
   ON (lc.claim_no = lcr.claim_no)
   WHEN MATCHED THEN
      UPDATE
         SET total_amt_paid = total ;Edited by: Salim Chelabi on 2009-06-08 08:51