Re: pgsql: doc: adjust UPDATE/DELETE's FROM/USING to match SELECT'sFROM

On Thu, Apr  2, 2020 at 07:32:49AM +0200, Peter Eisentraut wrote:
> On 2020-03-31 22:31, Bruce Momjian wrote:
> > doc: adjust UPDATE/DELETE's FROM/USING to match SELECT's FROM
> > 
> > Previously the syntax and wording were unclear.
> 
> @@ -23,7 +23,7 @@ PostgreSQL documentation
>  <synopsis>
>  [ WITH [ RECURSIVE ] <replaceable
> class="parameter">with_query</replaceable> [, ...] ]
>  DELETE FROM [ ONLY ] <replaceable
> class="PARAMETER">table_name</replaceable> [ * ] [ [ AS ] <replaceable
> class="parameter">alias</replaceable> ]
> -    [ USING <replaceable class="PARAMETER">using_list</replaceable> ]
> +    [ USING <replaceable class="parameter">from_item</replaceable> [, ...]
> ]
>      [ WHERE <replaceable class="PARAMETER">condition</replaceable> | WHERE
> CURRENT OF <replaceable class="PARAMETER">cursor_name</replaceable> ]
>      [ RETURNING * | <replaceable
> class="parameter">output_expression</replaceable> [ [ AS ] <replaceable
> class="parameter">output_name</replaceable> ] [, ...] ]
>  </synopsis>
> 
> This change doesn't make sense.  It is clearly a "using list" in the case of
> DELETE.  Trying to unify it with UPDATE is wrong because the syntax is in
> fact different.

This message from Tom requested the use of "from_list":

    https://www.postgresql.org/message-id/7354.1584500334%40sss.pgh.pa.us

    I think that the DELETE synopsis should look like
    
    
        [ USING <replaceable class="parameter">from_item</replaceable> [, ...] ]
    
    
    so that there's not any question which part of the SELECT syntax we're
    talking about. 

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
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