Subject: Re: empty view, replace view, column type change?
From: Rod Taylor <pg@rbt.ca>
To: Markus Bertheau <twanger@bluetwanger.de>
Cc: PgSQL - SQL <pgsql-sql@postgresql.org>
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References: <1119557009.7430.16.camel@localhost.localdomain>
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Date: Thu, 23 Jun 2005 16:19:44 -0400
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On Thu, 2005-06-23 at 22:03 +0200, Markus Bertheau wrote:
> Hi,
> 
> it seems to me that the following should work but it fails:
> 
> CREATE VIEW co AS SELECT LOCALTIMESTAMP::TIMESTAMP AS ov WHERE FALSE;
> CREATE TABLE link (ov TIMESTAMP);
> CREATE OR REPLACE VIEW co AS SELECT ov FROM link;

The data types are different, as one has the timestamp to (6) decimal
places after seconds.

development=# CREATE VIEW co AS SELECT LOCALTIMESTAMP::TIMESTAMP AS ov
WHERE FALSE;
CREATE VIEW
development=# CREATE TABLE link (ov TIMESTAMP);
CREATE TABLE
development=# CREATE OR REPLACE VIEW cod AS SELECT ov FROM link;
CREATE VIEW
development=# \d co
                    View "rbt.co"
 Column |              Type              | Modifiers
--------+--------------------------------+-----------
 ov     | timestamp(6) without time zone |
View definition:
 SELECT 'now'::text::timestamp(6) without time zone AS ov
  WHERE false;

development=# \d cod
                  View "rbt.cod"
 Column |            Type             | Modifiers
--------+-----------------------------+-----------
 ov     | timestamp without time zone |
View definition:
 SELECT link.ov
   FROM link;

--