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

we can combined insert and select statement

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

DECLARE

varCustID   Varchar(10);

BEGIN 

 insert into bill 
 values 
 select SEQBILLNO.NEXTVAL, 
        SYSDATE, 
        'UNPAID' , 
        100 ,
        CustID,SEQREADNO.CURRVAL 
 From  Address A
 Join  Meter M 
 on    A.postCode = M.postCode
 Where M.MeterID = :new.MeterID; 

END;

try the above code.