Oracle SQL: Detecting breaks in continual spans -

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i have following table , i'm trying detect products have break in spans.

product     | unit_cost | price start date |    price end date -------------------------------------------------------------------------- product 1     15.00         01/01/2011      03/31/2011 product 1     15.00         04/01/2011      06/31/2011 product 1     15.00         07/01/2011      09/31/2011 product 1     15.00         10/01/2011      12/31/2011  product 2     10.00         01/01/2011      12/31/2011  product 3     25.00         01/01/2011      06/31/2011 product 3     25.00         10/01/2011      12/31/2011

so here want report product3 because missing span

07/01/2011 - 09/31/2011

any ideas on how can this?

edit: oracle ver: 10g

create table statement  create table sandbox.tbl_product (   product_id        varchar2(13 byte),      product           varchar2(64 byte),   unit_cost         number,   price_start_date  date,   price_end_date    date )

edit 2 start dates , end dates cannot overlap

edit 3 span can 2 dates long price_end_date >= price_start_date. equal included since product can on sale 1 day.

try (using lead analytic function):

select *   (                 select a.*, lead(price_start_date,1,null) over(partition product order price_end_date) next_start_date           product        ) (price_end_date + 1)<> next_start_date

example setup

        create table product           (             product   varchar2(100 byte),             unit_cost number,             start_date date,             end_date date           );          insert product values('product 1','15.00',to_date('01/01/2011','mm/dd/rrrr'),to_date('03/31/2011','mm/dd/rrrr'));         insert product values('product 1','15.00',to_date('04/01/2011','mm/dd/rrrr'),to_date('06/30/2011','mm/dd/rrrr'));         insert product values('product 1','15.00',to_date('07/01/2011','mm/dd/rrrr'),to_date('09/30/2011','mm/dd/rrrr'));         insert product values('product 1','15.00',to_date('10/01/2011','mm/dd/rrrr'),to_date('12/31/2011','mm/dd/rrrr'));         insert product values('product 2','10.00',to_date('01/01/2011','mm/dd/rrrr'),to_date('12/31/2011','mm/dd/rrrr'));         insert product values('product 3','25.00',to_date('01/01/2011','mm/dd/rrrr'),to_date('06/30/2011','mm/dd/rrrr'));         insert product values('product 3','25.00',to_date('10/01/2011','mm/dd/rrrr'),to_date('12/31/2011','mm/dd/rrrr'));  select *   (                 select a.*, lead(start_date,1,null) over(partition product order start_date) next_start_date                   product               ) (end_date + 1)<> next_start_date

edit:updated query consider next start_date , current end_date avoid issues distribution of data.


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