From: Amit Shah <ashah@opuspro.com>
To: pgsql-sql@postgresql.org
Subject: Query for block updates
Date: Sun, 03 Dec 2006 17:19:44 -0500
Message-ID: <200612031719.44642.ashah@opuspro.com> (raw)
Hi,
If this question doesn't belong to this mailing list, please pardon.
I have a table with a few hundred million rows, and I need to write a query
that does something like follows --
Change all the values of a column to null where the value cannot be casted to
numeric(20,4)
I have it as varchar, and I need to convert it to numeric(20,4).
I am using this query - alter table optiondata ALTER volume TYPE numeric(20,4)
using cast(volume as numeric(20,4)); then wait for DB to complain, and then
update that value to null, and just keep doing this till all garbadge is
removed :-(
Thanks,
Amit
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Subject: Re: Query for block updates
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