How to code this?

Question

Hi All,
Our application development will need to come up with a solution to update table B and tables C whenever a value in table A is changed to a certain value. Since I am new to Oracle stored procedures, I would like get some help on this. Can someone advice as to how to code the following? I greatly appreciate your ideas. Thanks!
Scenario:
Whenever the value on the column DCMTN_RCPT_STUS_CD is changed to "C" for table supplier_documentation (Table A), the value on the column BID_STUS_CD for table dmepos_bid will need to be updated to "01" (Table B), at the same time the column on BID_STUS_CD for supplier_application (Table C) will also
need to be updated to "01".
Table A:
SQL> select SUPLR_ID, BIDDER_NUM, NSC_NUM, DCMTN_RCPT_STUS_CD from
supplier_documentation where DCMTN_RCPT_STUS_CD='C';
BIDDER_NUM DCMTN_RCPT_STUS_CD
1000000 C
1000003 C
Table B:
SQL>select BIDDER_NUM, BID_STUS_CD from dmepos_bid order by bidder_num;
BIDDER_NUM BID_STUS_C
1000000
1000003
Table C:
SQL> select BIDDER_NUM, APLCTN_STUS_CD from supplier_application;
BIDDER_NUM APLCTN_STUS_CD
1000000
1000003

Answer 1

See Oracle row-level triggers:
http://download-uk.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg13trg.htm#376
SQL> create or replace trigger tr_01
  2  after update of DCMTN_RCPT_STUS_CD on supplier_documentation
  3  for each row
  4  when (new.DCMTN_RCPT_STUS_CD = 'C')
  5  begin
  6   update dmepos_bid set BID_STUS_C = :new.DCMTN_RCPT_STUS_CD
  7   where BIDDER_NUM = :new.BIDDER_NUM;
  8   update supplier_application set BID_STUS_C = :new.DCMTN_RCPT_STUS_CD
  9   where BIDDER_NUM = :new.BIDDER_NUM;
10  end;
11  /
Trigger created.
SQL> select * from supplier_documentation;
BIDDER_NUM DC
   1000000
   1000003
SQL> select * from dmepos_bid;
BIDDER_NUM BI
   1000000
   1000003
SQL> select * from supplier_application;
BIDDER_NUM BI
   1000000
   1000003
SQL> update supplier_documentation set DCMTN_RCPT_STUS_CD = 'B'
  2  where BIDDER_NUM = 1000000;
1 row updated.
SQL> select * from supplier_documentation;
BIDDER_NUM DC
   1000000 B
   1000003
SQL> select * from dmepos_bid;
BIDDER_NUM BI
   1000000
   1000003
SQL> select * from supplier_application;
BIDDER_NUM BI
   1000000
   1000003
SQL> update supplier_documentation set DCMTN_RCPT_STUS_CD = 'C'
  2  where BIDDER_NUM = 1000000;
1 row updated.
SQL> select * from supplier_documentation;
BIDDER_NUM DC
   1000000 C
   1000003
SQL> select * from dmepos_bid;
BIDDER_NUM BI
   1000000 C
   1000003
SQL> select * from supplier_application;
BIDDER_NUM BI
   1000000 C
   1000003Rgds.