Обсуждение: FETCH FIRST

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FETCH FIRST

От
Simon Riggs
Дата:
SQL200n specifies a new command similar to our LIMIT

FETCH { FIRST | NEXT } n { ROW | ROWS } ONLY

and also that the OFFSET command can have an optional suffix

{ ROW | ROWS }

Seems like a % project for the TODO list

--  Simon Riggs 2ndQuadrant  http://www.2ndQuadrant.com 
 PostgreSQL UK 2008 Conference: http://www.postgresql.org.uk

Re: FETCH FIRST

От
Bruce Momjian
Дата:
Simon Riggs wrote:
> SQL200n specifies a new command similar to our LIMIT
> 
> FETCH { FIRST | NEXT } n { ROW | ROWS } ONLY
> 
> and also that the OFFSET command can have an optional suffix
> 
> { ROW | ROWS }
> 
> Seems like a % project for the TODO list

Where does this FETCH appear in a SELECT?

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://postgres.enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +

Re: FETCH FIRST

От
Simon Riggs
Дата:
On Tue, 2008-03-25 at 10:45 -0400, Bruce Momjian wrote:
> Simon Riggs wrote:
> > SQL200n specifies a new command similar to our LIMIT
> > 
> > FETCH { FIRST | NEXT } n { ROW | ROWS } ONLY
> > 
> > and also that the OFFSET command can have an optional suffix
> > 
> > { ROW | ROWS }
> > 
> > Seems like a % project for the TODO list
> 
> Where does this FETCH appear in a SELECT?

It's supposed to go *after* the OFFSET clause in a query, but making it
a simple synonym for LIMIT seems most sensible.

It's also allowed as part of the WITH clause (that we don't yet have).

--  Simon Riggs 2ndQuadrant  http://www.2ndQuadrant.com 
 PostgreSQL UK 2008 Conference: http://www.postgresql.org.uk

Re: FETCH FIRST

От
Tom Lane
Дата:
Simon Riggs <simon@2ndquadrant.com> writes:
> On Tue, 2008-03-25 at 10:45 -0400, Bruce Momjian wrote:
>> Where does this FETCH appear in a SELECT?

> It's supposed to go *after* the OFFSET clause in a query, but making it
> a simple synonym for LIMIT seems most sensible.

Huh?  OFFSET isn't in standard SQL either.  Are you sure you're not
confusing FETCH-from-a-cursor with SELECT?
        regards, tom lane

Re: FETCH FIRST

От
Simon Riggs
Дата:
On Tue, 2008-03-25 at 11:47 -0400, Tom Lane wrote:
> Simon Riggs <simon@2ndquadrant.com> writes:
> > On Tue, 2008-03-25 at 10:45 -0400, Bruce Momjian wrote:
> >> Where does this FETCH appear in a SELECT?
> 
> > It's supposed to go *after* the OFFSET clause in a query, but making it
> > a simple synonym for LIMIT seems most sensible.
> 
> Huh?  OFFSET isn't in standard SQL either. 

Tis now.

>  Are you sure you're not
> confusing FETCH-from-a-cursor with SELECT?

Quite sure.

--  Simon Riggs 2ndQuadrant  http://www.2ndQuadrant.com 
 PostgreSQL UK 2008 Conference: http://www.postgresql.org.uk