Detect overlapping date ranges from the same table

Question

I have a table with the following data

PKey  Start       End         Type
====  =====       ===         ====
01    01/01/2010  14/01/2010  S
02    15/01/2010         


        

Answer 1

BTW - If you don't have a unique id , against your dates you can do this is oracle..FYI

with date_ranges
as
(
SELECT 
     rownum as pkey,
    date_ranges.*
FROM  date_ranges
) 
select 
dr1.* 
from 
date_ranges dr1 , date_ranges dr2
where  dr1.pkey > dr2.pkey
AND dr1.end_dt >= dr2.start_dt 
AND dr2.end_dt >= dr1.start_dt