From: Erik Thiele <erik@thiele-hydraulik.de>
To: pgsql-sql@postgresql.org
Subject: summing tables
Date: Tue, 15 Jul 2003 14:09:21 +0200
Message-ID: <20030715140921.7c5a6a6c.erik@thiele-hydraulik.de> (raw)
hi,
i have a table consisting of 4 integers.
seq is for making the table ordered. (ORDER BY SEQ ASC)
a,b,c maybe null
seq | a | b | c
-----+----+----+---
0 | 1 | 2 | 3
1 | 1 | 2 |
2 | 5 | 7 |
3 | -2 | -4 |
i am needing a sql statement to do
c=a+b+"the c of the row with seq one less than myself"
this statement has to run over the whole table, in seq order.
how can this be acomplished???
cu&thanks
erik
--
Erik Thiele
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To: pgsql-sql@postgresql.org
Cc: erik@thiele-hydraulik.de
Subject: Re: summing tables
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