RE: Tricky SQL extraction question

Your could try something like this:
With x as (Select Row_Number() Over(Partition By Client Order By StartDate)
Lfd,
a.*
from MyTable a)
Select *
from x join x y on x.Client = y.Client and x.lfd = y.lfd-1
Where x.EndDate > y.StartDate
or x.EndDate <> y.StartDate - 1 Day;

Mit freundlichen Grüßen / Best regards

Birgitta Hauser
Modernization ? Education ? Consulting on IBM i
Database and Software Architect
IBM Champion since 2020

"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
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Einstein)

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Dave
Sent: Wednesday, 20 December 2023 18:27
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Tricky SQL extraction question

Hi,

I never thought I would need to make a request and SQL could not help me,
but I can't see how I could use it here.
Any ideas how I can accomplish this? In the exemple, I need to extract
clients C3 and C4. C3 because one of the periods overlap; C4 because the 2nd
period does not immediately follow the 1st one.

Client StartDate EndDate
C1 2023-05-31
C2 2023-01-01 2023-04-15
C2 2023-04-16 2023-12-31
C3 2023-02-28 2023-06-01
C3 2023-04-01
C4 2023-10-11 2023-11-13
C4 2023-11-15

Thanks!
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