From: | Gordon Ross <gr306(at)ucs(dot)cam(dot)ac(dot)uk> |
---|---|
To: | "pgsql-sql(at)postgresql(dot)org" <pgsql-sql(at)postgresql(dot)org> |
Subject: | Unable to get UPDATE ... FROM syntax correct |
Date: | 2010-02-19 09:25:48 |
Message-ID: | C7A4099C.4726%gr306@staff-ad.csi.cam.ac.uk |
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Lists: | pgsql-sql |
I have two tables:
Table "public.audit"
Column | Type | Modifiers
------------+----------------------+-----------
id | integer | (serial)
record_id | integer | not null
key | character varying |
(...)
Table "public.extension"
Column | Type | Modifiers
---------+------------+------------
id | integer | (serial)
number | integer |
(...)
The column "key" was recently added to the "audit" table, and I wish to
populate it with the value form the "number" column in the extension table.
The join between the tables is audit.record_id = extension.id
I tried:
UPDATE audit SET key = extension.number FROM extension WHERE audit.record_id
= extension.number;
But that returns saying "UPDATE 0"
However, doing:
SELECT audit.record_id, extension.number FROM audit, extension WHERE
audit.record_id = extension.id;
Works fine.
Can someone tell me what I'm doing wrong ?
Thanks,
GTG
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