Groups > comp.databases.ms-sqlserver > #2095

Re: UPDATE FROM

From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: UPDATE FROM
Date	2021-07-19 20:52 +0200
Organization	Erland Sommarskog
Message-ID	<XnsAD6CD46A1C54EYazorman@127.0.0.1> (permalink)
References	<20210719121448.6ece4302949ccaaee268158c@g{oogle}mail.com> <20210719172138.5d4e4628fc7454f1c19fc659@g{oogle}mail.com>

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Anton Shepelev (anton.txt@g{oogle}mail.com) writes:
> Question withdrawn. It was an error in my logic, whereas
> the syntax is quite clear. The simplest UPDATED from another
> table does *not* requre that it the table begin updated be
> mentioned in the FROM clause:
> 
>   UPDATE upd_tab
>   SET col = data_tab.col
>   FROM data_tab
>   WHERE data_tab.code = upd_tab.code
> 

Whereas this is legal and produces something, I definitely recommend 
against it. I will have to admit that I don't understand what this is
doing - and I certainly play an SQL expert on TV.

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UPDATE FROM Anton Shepelev <anton.txt@g{oogle}mail.com> - 2021-07-19 12:14 +0300
  Re: UPDATE FROM Anton Shepelev <anton.txt@g{oogle}mail.com> - 2021-07-19 12:23 +0300
  Re: UPDATE FROM Anton Shepelev <anton.txt@g{oogle}mail.com> - 2021-07-19 17:21 +0300
    Re: UPDATE FROM Erland Sommarskog <esquel@sommarskog.se> - 2021-07-19 20:52 +0200
      Re: UPDATE FROM Anton Shepelev <antonius@freeshell.de> - 2021-07-20 17:12 +0300

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