Dynamic Update Tabular form

Question

I have a tabular form on Table 1 (an empty table)
I want to populate Table_1/tabular form with Table 2 values
Table_1 & Table_2 are linked by pk/fk relationship (Main_Route)
Basically, There will be a select list for Main_routes on the Table_1/tabular form. Once I hit the Apply changes button, I want it to get the values for street, ward, & section from Table_2.
How do I achieve this? Is there some kind of trigger I can use, page process, or item-level sql?
Table_1
ID (number) (pk)
Main_Route (varchar 2(30))
Street (varchar 2(30))
Ward (varchar 2(30))
Section (varchar 2(30))
Table_2
Main_Route (varchar 2(30)) (pk)
Street (varchar 2(30))
Ward (varchar 2(30))
Section (varchar 2(30))

Answer 1

Hi,
Go to SQL Workshop, SQL Commands and then run this:
CREATE OR REPLACE TRIGGER  "TABLE1_BI"
BEFORE
INSERT OR UPDATE ON "TABLE1"
FOR EACH ROW
BEGIN
  DECLARE
    vSTREET VARCHAR2(30);
    vWARD VARCHAR2(30);
    vSECTION VARCHAR2(30);
  BEGIN
    IF :NEW.MAIN_ROUTE IS NOT NULL THEN
      SELECT STREET, WARD, SECTION
      INTO vSTREET, vWARD, vSECTION
      FROM TABLE2
      WHERE MAIN_ROUTE = :NEW.MAIN_ROUTE;
      :NEW.STREET := vSTREET;
      :NEW.WARD := vWARD;
      :NEW.SECTION := vSECTION;
    ELSE
      :NEW.STREET := NULL;
      :NEW.WARD := NULL;
      :NEW.SECTION := NULL;
    END IF;
  END;
END;followed by:
ALTER TRIGGER "TABLE1_BI" ENABLEThis should run on TABLE1 for any insert or update. As long as ROUTE_MAIN has a value, then the related information is retrieved from TABLE2 and used to update the record on TABLE1. If ROUTE_MAIN is empty, then the other fields are emptied as well.
Andy