From: Fay Du <fay.du@versaterm.com>
To: pgsql-sql@postgresql.org
Subject: Update question
Date: Tue, 28 Mar 2006 11:41:39 -0500
Message-ID: <00b801c65286$7ca8f260$b8d849c6@versaterm.com> (raw)
Hi all:
I have a table like this:
Table cost
Id edge_id cost
1 30 101.4
2 30 null
3 40 500.2
4 40 null
5 45 300.7
6 45 null
I want to set cost value with same edge_id by same value. The existing
values are calculated by calling a function (calculate edge length). I
can calculate the value by same function, but the function was slow. I
wander if I can use update statement to set the second value with same
edge_id. Thanks in advance for your help.
Fay
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To: pgsql-sql@postgresql.org
Cc: fay.du@versaterm.com
Subject: Re: Update question
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