Select rows based on condition of same row

Question

Hello,
I have the following table structure and rows defind here
http://sqlfiddle.com/#!4/3f474/3
I would like to select rows if PRODUCT_NO is null then I need to select rows which are having IS_PAYABLE='Y'. If PRODUCT_NO is not null
then IS_PAYABLE will be 'N' or IS_PAYABLE will be null.
E.g.
For PRODUCT_REG HPO_FABRIC, one PRODUCT_NO null so I need select that row only, not the other two rows.
I can do
select * from SUPPLIER_DETAILS where  IS_PAYABLE='Y', but what if there are many records with PRODUCT_NO having null or not null
How can I do this using sql?

Answer 1

This simple query!!!
select *
  from supplier_details
where (product_no is null
    and is_payable = 'Y')
   or (product_no is not null and is_payable is null);
PRODUCT_REG                                                                                          PRODUCT_SUPPLIER_CODE PRODUCT_NO START_DATE                END_DATE                  IS_PAYABLE
HPO_FABRIC                                                                                           JP_008                           01-AUG-01                 31-AUG-01                 Y         
HPO_FABRIC                                                                                           JP_008                STGA-FABR1 16-AUG-01                 31-AUG-01                            --Edited:- Modified Query and Results for 2nd Requirement
Edited by: Purvesh K on Sep 17, 2012 4:55 PM
--Removed NVL
Edited by: Purvesh K on Sep 17, 2012 5:04 PM