How to get the discount number of customers in pri

I have a requirement where I supposed to roll customer data in the prior period of 365 days.

Table:

CREATE TABLE orders     ( 
  persistent_key_str character varying, 
  ord_id character varying(50), 
  ord_submitted_date date, 
  item_sku_id character varying(50), 
  item_extended_actual_price_amt numeric(18,2) 
);

Sample data:

INSERT INTO orders VALUES
('01120736182','ORD6266073'  ,'2010-12-08','100856-01',39.90), 
('01120736182','ORD33997609' ,'2011-11-23','100265-01',49.99), 
('01120736182','ORD33997609' ,'2011-11-23','200020-01',29.99), 
('01120736182','ORD33997609' ,'2011-11-23','100817-01',44.99), 
('01120736182','ORD89267964' ,'2012-12-05','200251-01',79.99), 
('01120736182','ORD89267964' ,'2012-12-05','200269-01',59.99), 
('01011679971','ORD89332495' ,'2012-12-05','200102-01',169.99), 
('01120736182','ORD89267964' ,'2012-12-05','100907-01',89.99), 
('01120736182','ORD89267964' ,'2012-12-05','200840-01',129.99), 
('01120736182','ORD125155068','2013-07-27','201443-01',199.99), 
('01120736182','ORD167230815','2014-06-05','200141-01',59.99), 
('01011679971','ORD174927624','2014-08-16','201395-01',89.99), 
('01000217334','ORD92524479' ,'2012-12-20','200021-01',29.99), 
('01000217334','ORD95698491' ,'2013-01-08','200021-01',19.99), 
('01000217334','ORD90683621' ,'2012-12-12','200021-01',29.990), 
('01000217334','ORD92524479' ,'2012-12-20','200560-01',29.99), 
('01000217334','ORD145035525','2013-12-09','200972-01',49.99), 
('01000217334','ORD145035525','2013-12-09','100436-01',39.99), 
('01000217334','ORD90683374' ,'2012-12-12','200284-01',39.99), 
('01000217334','ORD139437285','2013-11-07','201794-01',134.99), 
('01000827006','W02238550001','2010-06-11','HL 101077',349.000), 
('01000827006','W01738200001','2009-12-10','EL 100310 BLK',119.96), 
('01000954259','P00444170001','2009-12-03','PC 100455 BRN',389.99), 
('01002319116','W02242430001','2010-06-12','TR 100966',35.99), 
('01002319116','W02242430002','2010-06-12','EL 100985',99.99), 
('01002319116','P00532470001','2010-05-04','HO 100482',49.99);

Using the query below I am trying to get the number of distinct customers by order_submitted_date:

select
    g.order_date as "Ordered",
    count(distinct o.persistent_key_str) as "customers"
from
    generate_series(
        (select min(ord_submitted_date) from orders),
        (select max(ord_submitted_date) from orders),
        '1 day'
    ) g (order_date) 
left join
    orders o on o.ord_submitted_date between g.order_date - interval '364 days'
                                         and g.order_date
WHERE extract(year from ord_submitted_date) <= 2009
group by 1
order by 1

This is the output I expected.

Ordered      Customers
2009-12-03   1
2009-12-10   1

When I execute the query above I get incorrect results.
How can I make this right?

To get your expected output ("the number of distinct customers") - only days with actual orders 2009:

SELECT ord_submitted_date, count(DISTINCT persistent_key_str) AS customers
FROM   orders
WHERE  ord_submitted_date >= '2009-1-1'
AND    ord_submitted_date <  '2010-1-1'
GROUP  BY 1
ORDER  BY 1;

Formulate the WHERE conditions this way to make the query sargable, and input easy.

If you want one row per day (from the earliest entry up to the latest in orders) - within 2009:

SELECT ord_submitted_date AS ordered
     , count(DISTINCT o.persistent_key_str) AS customers
FROM  (SELECT generate_series(min(ord_submitted_date)  -- single query ...
                            , max(ord_submitted_date)  -- ... to get min / max
                            , '1d')::date FROM orders) g (ord_submitted_date) 
LEFT   join orders o USING (ord_submitted_date)
WHERE  ord_submitted_date >= '2009-1-1'
AND    ord_submitted_date <  '2010-1-1'
GROUP BY 1
ORDER BY 1;

SQL Fiddle.

Distinct customers per year

SELECT extract(year from ord_submitted_date) AS year
     , count(DISTINCT persistent_key_str) AS customers
FROM   orders
GROUP  BY 1
ORDER  BY 1;

SQL Fiddle.