From: Stöcker, Martin <Martin.Stoecker@etl-datenservice.de>
To: pgsql-sql@lists.postgresql.org <pgsql-sql@lists.postgresql.org>
To: ml@ft-c.de <ml@ft-c.de>
Subject: AW: recursive sql
Date: Sun, 9 Aug 2020 07:55:00 +0000
Message-ID: <f890658548ac4f8cb7e6cef6d9179605@etl-datenservice.de> (raw)
In-Reply-To: <eaf4082e-79ac-7a5d-bcf8-63ce66087365@ft-c.de>
References: <eaf4082e-79ac-7a5d-bcf8-63ce66087365@ft-c.de>
Hi Franz
I think you don't need to use recursivy but window function will do.
Mit freundlichen Grüßen
Martin Stöcker
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________________________________
Von: ml@ft-c.de <ml@ft-c.de>
Gesendet: Sonntag, 9. August 2020 08:28:44
An: pgsql-sql@lists.postgresql.org
Betreff: recursive sql
Hello,
the table
create table tt (
ts timestamp,
c numeric) ;
insert into tt values
('2019-12-31',1), ('2020-01-01',2),
('2020-07-02',3), ('2020-07-06',4),
('2020-07-07',5), ('2020-07-08',6);
My question: It is possible to get an
additional column (named c2)
with
( c from current row ) + ( c2 from the previous row ) as c2
the result:
ts c c2
.. 1 1 -- or null in the first row
.. 2 3
.. 3 6
.. 4 10
...
with recursive ema as ()
select ts, c,
-- many many computed_rows
-- <code> as c2
from tt -- <- I need tt on this place
thank you for help
Franz
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Cc: Martin.Stoecker@etl-datenservice.de, pgsql-sql@lists.postgresql.org, ml@ft-c.de
Subject: Re: AW: recursive sql
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