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Message from discussion Reduce To Ranges aggregate function
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Dieter Noeth  
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 More options Oct 21 2006, 12:19 pm
Newsgroups: comp.databases.oracle.misc
From: Dieter Noeth <dno...@gmx.de>
Date: Sat, 21 Oct 2006 18:19:35 +0200
Local: Sat, Oct 21 2006 12:19 pm
Subject: Re: Reduce To Ranges aggregate function
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Mike King wrote:
>  ID
> ----
> 1
> 2
> 3
> 4
> 5
> 11
> 12
> 45

> Reduced form: 1-5,11-12,45

Consecutive values are easy to find using OLAP-functions:

select
   min(id), max(id)
from
  (
   select
     id,
     id - row_number() over (order by id) grp
   from t
  ) dt
group by grp

If id is not unique use dense_rank instead of row_number...

Dieter


 
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