Re: Thoughts on "SELECT * EXCLUDING (...) FROM ..."?

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Eric Ridge <eebbrr(at)gmail(dot)com>
Cc: Stephen Frost <sfrost(at)snowman(dot)net>, Marti Raudsepp <marti(at)juffo(dot)org>, Marcin Mańk <marcin(dot)mank(at)gmail(dot)com>, Mark Mielke <mark(at)mark(dot)mielke(dot)cc>, Darren Duncan <darren(at)darrenduncan(dot)net>, David Wilson <david(dot)t(dot)wilson(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Subject: Re: Thoughts on "SELECT * EXCLUDING (...) FROM ..."?
Date: 2011-11-01 17:03:51
Message-ID: CAFj8pRB_+cjG66zBfhZDA7GpOBTpHHe0tXka-eMFpqga_7ej_w@mail.gmail.com
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2011/11/1 Eric Ridge <eebbrr(at)gmail(dot)com>:
> On Tue, Nov 1, 2011 at 12:24 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>> some other idea - but only for psql
>>
>> we can define a special values, that ensure a some necessary
>> preexecution alchemy with entered query
>>
>> \pset star_exclude_names col1, col2, col3
>> \pset star_exclude_types xml, bytea, text(unlimited)
>>
>
> Sure, something like that could be useful too.  It might be confusing
> to users if they forget that they set an exclusion list, but there's
> probably ways to work around that.
>
> However, the nice thing about the feature being in SQL is that you can
> use it from all clients, and even in other useful ways.  COPY would be
> an example (something I also do frequently):
>
> COPY (SELECT * EXCLUDING (a, b, c) FROM <big query>) TO 'somefile.csv' WITH CSV;
>
> Right now, if you want to exclude a column, you have to list all the
> others out manually, or just dump everything and deal with it in an
> external tool.
>
> I generally agree with everyone that says using this in application
> code is a bad idea, but I don't think that's reason alone to reject
> the idea on its face.
>
> eric
>

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