Parameters in a PROC

Question

Can any one please tell me how to deal with parameters within a procedure.
I am passing 2 dates to the procedure. Later I am trying to delete all the records that are greater than one date and also delete all those records that are lesser than oher date.
When I run this proc I am getting few erros which as as follows:
ORA-06550: line 7, column 24:
PLS-00382: expression is of wrong type
ORA-06550: line 7, column 3:
PL/SQL: Statement ignored
ORA-06550: line 8, column 30:
PLS-00382: expression is of wrong type
ORA-06550: line 8, column 3:
PL/SQL: Statement ignored
PROCEDURE
CREATE OR REPLACE procedure Cos_Proc(service_life_date date, invoice_date_in_90_days date)
IS
BEGIN
DELETE from COS_RENEWALS_FEB where COS_invoice_date > to_date('invoice_date_in_90_days','yyyy/mm/dd');
DELETE from COS_RENEWALS_FEB where COS_invoice_date < to_date('service_life_date','yyyy/mm/dd');
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
-- Consider logging the error and then re-raise
RAISE;
END PROC4;
/

Answer 1

I see several problems:
1. Your paramaters are already of type DATE, so there is no need to use the TO_DATE function.
2. You have placed single quotes around your parameter names, treating them as literal string values.
Also, you do not need to handle the NO_DATA_FOUND exception, as it is not relevant in this scenario.
Try something like this:
CREATE OR REPLACE procedure Cos_Proc(service_life_date date, invoice_date_in_90_days date)
IS
BEGIN
  DELETE from COS_RENEWALS_FEB where COS_invoice_date > invoice_date_in_90_days;
  DELETE from COS_RENEWALS_FEB where COS_invoice_date < service_life_date;
EXCEPTION
  WHEN OTHERS THEN
    -- Consider logging the error and then re-raise
    RAISE;
END Cos_Proc;