UPDATE admin
SET parent = SUBSTR(id,1,4);
Doesn't it do what you want?
Best,
Oliveiros
----- Original Message -----
From: "ssylla" <stefansy...@gmx.de>
To: <pgsql-sql@postgresql.org>
Sent: Thursday, February 09, 2012 1:58 AM
Subject: [SQL] update column
Dear list,
sorry, I already posted this, but it did not seem to have been accepted by
the mailing list. So here's my second try:
I need to update all rows of a column ('parent') based on a subquery that
returns me the first four digits of another column ('id'):
UPDATE admin SET parent=(SELECT SUBSTR(id,1,4) FROM admin);
After executing, I get the following error-message:
"more than one row returned by a subquery used as an expressionmore than
one
row returned by a subquery used as an expression"
I am not quite sure about that, but maybe I need to construct a
function/loop to fulfill this task?
thanks for help.
Stefan
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