Create trigger to insert into another table

Question

I have some problem executing the trigger below:

CREATE OR REPLACE TRIGGER AFTERINSERTCREATEBILL
AFTER INSERT
ON READING
FOR EACH ROW 

DECLARE

varReadNo   Int;         


        

Answer 1

Add exception handling in your trigger and see what is happening, by doing it would be easy for you to track the exceptions.

CREATE OR REPLACE TRIGGER AFTERINSERTCREATEBILL
AFTER INSERT
ON READING
FOR EACH ROW 

DECLARE

  varCustID   Varchar(10);

BEGIN 

  -- your code

EXCEPTION
    WHEN NO_DATA_FOUND
    THEN
        DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQLERRM(-20299)));
    WHEN OTHERS THEN
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQLERRM(-20298)));

END;