Re: a proposal for a new functionality: "SELECT * [EXCEPT col1[,col2]]

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От Fabio Ugo Venchiarutti
Тема Re: a proposal for a new functionality: "SELECT * [EXCEPT col1[,col2]]
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Msg-id 1d18c9e2-ce3f-05b8-5b6e-3b959c527dac@ocado.com
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Ответ на Re: a proposal for a new functionality: "SELECT * [EXCEPT col1 [,col2]]  (Josef Šimánek <josef.simanek@gmail.com>)
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That makes sense, however for my general use case I'd also like the
ability to mark some columns as not match-able by `SELECT * FROM
<table>` and `TABLE <table>`  at table definition without having to
create dedicated views (think of the way system attributes such as
tableoid, cmax, cmin ... are handled) .



Typical use case: manual inspection of rows containing an hefty payload
field and some metadata ones; the payload more often than not isn't the
bit I'm interested in, but the size of it dominates the output making it
hard to read (granted - psql has formatting options to handle that, but
having a sane default at the table level would help a lot).



One may argue that such behaviour breaks the principle of least
surprise, so all of this should probably be strictly opt-in (and perhaps
queries could output some hints that such hidden columns exists).



Regards


F



On 25/02/2020 10:30, Josef Šimánek wrote:
> Just to mention, similar concept can be found in Google BigQuery.
>
> https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#select-except
> https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#select-replace
>
> út 25. 2. 2020 v 11:18 odesílatel Stanislav Motyčka
> <stanislav.motycka@gmail.com <mailto:stanislav.motycka@gmail.com>> napsal:
>
>     Hello,
>
>     Sometimes (for tables with many columns) it would be better and
>     easier to write "SELECT" statement with clause "EXCEPT":
>     "SELECT * [EXCEPT col1 [,col2]] FROM ..."
>
>     It's easier to write "except" one or two columns from all (*) as to
>     write names of all columns besides one or two.
>     What do you thin about it?
>
>     Best regards
>     Stano Motycka
>

--
Regards

Fabio Ugo Venchiarutti
OSPCFC Network Engineering Dpt.
Ocado Technology

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