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From: Josh Berkus <josh@agliodbs.com>
Organization: Aglio Database Solutions
To: Alvaro Herrera <alvherre@dcc.uchile.cl>
Subject: Re: Missing doc on expression format for ALTER TABLE
Date: Sun, 27 Mar 2005 21:50:47 -0800
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Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-docs@postgresql.org
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Guys,

> > Well, yes, actually.  Where in the documentation is a type conversion
> > expression defined?   Do we use NEW and OLD?  Or the name of the column? 
> > Or something else?
>
> I think the ALTER TABLE page is in dire need of a "See also" section, at
> least.  And a reference to where <expression> is defined would be nice
> to have.

What I'm pointing out here is that the USING clause can't be just ANY 
expression, it needs to be a specific type of expression.   And the docs 
don't explain what kind of expression is usable here.   Even a single example 
would go a long way ...

-- 
Josh Berkus
Aglio Database Solutions
San Francisco