Thread

  1. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Tom Lane <tgl@sss.pgh.pa.us> — 1998-10-18T16:04:49Z

    Bruce Momjian <maillist@candle.pha.pa.us> writes:
    > What if someone wants the rows from 500 to the end.  Should we allow
    > the syntax to be:
    >          SELECT ... [LIMIT count] [OFFSET offset]
    > LIMIT and OFFSET are independent.
    
    I like that syntax the best, but remember we are not inventing in
    a green field here.  Isn't this a feature that already exists in
    other DBMs?  We should probably copy their syntax, unless it's
    truly spectacularly awful...
    
    			regards, tom lane
    
    
  2. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Oleg Bartunov <oleg@sai.msu.su> — 1998-10-18T17:45:24Z

    On Sun, 18 Oct 1998, Tom Lane wrote:
    
    > Date: Sun, 18 Oct 1998 12:04:49 -0400
    > From: Tom Lane <tgl@sss.pgh.pa.us>
    > To: Bruce Momjian <maillist@candle.pha.pa.us>
    > Cc: pgsql-hackers@postgreSQL.org
    > Subject: Re: [HACKERS] SELECT ... LIMIT (trial implementation) 
    > 
    > Bruce Momjian <maillist@candle.pha.pa.us> writes:
    > > What if someone wants the rows from 500 to the end.  Should we allow
    > > the syntax to be:
    > >          SELECT ... [LIMIT count] [OFFSET offset]
    > > LIMIT and OFFSET are independent.
    > 
    > I like that syntax the best, but remember we are not inventing in
    > a green field here.  Isn't this a feature that already exists in
    > other DBMs?  We should probably copy their syntax, unless it's
    > truly spectacularly awful...
    > 
    > 			regards, tom lane
    > 
    
    Mysql uses LIMIT [offset,] rows 
    >From documentation:
    
          LIMIT takes one or two numeric arguments. A single argument
          represents the maximum number of rows to return in a result. If two
          arguments are given the first argument is the offset to the first row to
          return, while the second is the maximum number of rows to return in the
          result. 
    
    What would be nice if somehow total number of rows could be returned.
    This is often needed for altavista-like application.
    Of course, I can do
    select count(*) from sometable ... LIMIT offset, rows
    and then
    select ... from sometable ... LIMIT offset, rows
    but this seems not elegant solution.
    
    	Regards,
    
    		Oleg
    _____________________________________________________________
    Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
    Sternberg Astronomical Institute, Moscow University (Russia)
    Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
    phone: +007(095)939-16-83, +007(095)939-23-83
    
    
    
  3. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Jan Wieck <jwieck@debis.com> — 1998-10-18T19:29:43Z

    Oleg Bartunov wrote:
    
    > On Sun, 18 Oct 1998, Tom Lane wrote:
    >
    > > Bruce Momjian <maillist@candle.pha.pa.us> writes:
    > > > What if someone wants the rows from 500 to the end.  Should we allow
    > > > the syntax to be:
    > > >          SELECT ... [LIMIT count] [OFFSET offset]
    > > > LIMIT and OFFSET are independent.
    > >
    > > I like that syntax the best, but remember we are not inventing in
    > > a green field here.  Isn't this a feature that already exists in
    > > other DBMs?  We should probably copy their syntax, unless it's
    > > truly spectacularly awful...
    > >
    > >            regards, tom lane
    > >
    >
    > Mysql uses LIMIT [offset,] rows
    > >From documentation:
    >
    >       LIMIT takes one or two numeric arguments. A single argument
    >       represents the maximum number of rows to return in a result. If two
    >       arguments are given the first argument is the offset to the first row to
    >       return, while the second is the maximum number of rows to return in the
    >       result.
    
        Simple change, just flip them in gram.y.
    
        And for the 500 to end:
    
            SELECT ... LIMIT 500, 0 (after flipped)
    
        The  0  has  the  same meaning as ALL. And that could also be
        added to the parser easily so one can say
    
            SELECT ... LIMIT 500, ALL
    
        too.
    
    >
    > What would be nice if somehow total number of rows could be returned.
    > This is often needed for altavista-like application.
    > Of course, I can do
    > select count(*) from sometable ... LIMIT offset, rows
    > and then
    > select ... from sometable ... LIMIT offset, rows
    > but this seems not elegant solution.
    
        Absolutely makes no sense  for  me.  As  said  in  the  other
        posting,  aggregates  do  the counting scan in a deeper level
        and thus cannot get limited. So if you invoke  an  aggregate,
        the whole scan is always done.
    
    
    Jan
    
    --
    
    #======================================================================#
    # It's easier to get forgiveness for being wrong than for being right. #
    # Let's break this rule - forgive me.                                  #
    #======================================== jwieck@debis.com (Jan Wieck) #
    
    
    
    
  4. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Terry Mackintosh <terry@terrym.com> — 1998-10-18T19:58:57Z

    On Sun, 18 Oct 1998, Tom Lane wrote:
    
    > Bruce Momjian <maillist@candle.pha.pa.us> writes:
    > > What if someone wants the rows from 500 to the end.  Should we allow
    > > the syntax to be:
    > >          SELECT ... [LIMIT count] [OFFSET offset]
    > > LIMIT and OFFSET are independent.
    > 
    > I like that syntax the best, but remember we are not inventing in
    > a green field here.  Isn't this a feature that already exists in
    > other DBMs?  We should probably copy their syntax, unless it's
    > truly spectacularly awful...
    > 
    > 			regards, tom lane
    
    None that I have used (VFP, M$ SQL Server) that had 'LIMIT', had 'OFFSET'.
    So it would seem that the very idea of OFFSET is to break with what others
    are doing.
    
    I too like the above syntax. 
    Why mimic, when you can do better?  Go for it!
    
    Just my vote, have a great day
    Terry Mackintosh <terry@terrym.com>          http://www.terrym.com
    sysadmin/owner  Please! No MIME encoded or HTML mail, unless needed.
    
    Proudly powered by R H Linux 4.2, Apache 1.3, PHP 3, PostgreSQL 6.3
    -------------------------------------------------------------------
    Success Is A Choice ... book by Rick Patino, get it, read it!
    
    
    
  5. CVS ...

    Egon Schmid <eschmid@delos.stuttgart.netsurf.de> — 1998-10-18T20:00:39Z

    Hi folks,
    Fatal error, aborting.
    : no such user
    
    -Egon
    
    
    
    
  6. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Jan Wieck <jwieck@debis.com> — 1998-10-18T20:05:31Z

    >
    > On Sun, 18 Oct 1998, Tom Lane wrote:
    >
    > > Bruce Momjian <maillist@candle.pha.pa.us> writes:
    > > > What if someone wants the rows from 500 to the end.  Should we allow
    > > > the syntax to be:
    > > >          SELECT ... [LIMIT count] [OFFSET offset]
    > > > LIMIT and OFFSET are independent.
    > >
    > > I like that syntax the best, but remember we are not inventing in
    > > a green field here.  Isn't this a feature that already exists in
    > > other DBMs?  We should probably copy their syntax, unless it's
    > > truly spectacularly awful...
    > >
    > >            regards, tom lane
    >
    > None that I have used (VFP, M$ SQL Server) that had 'LIMIT', had 'OFFSET'.
    > So it would seem that the very idea of OFFSET is to break with what others
    > are doing.
    >
    > I too like the above syntax.
    > Why mimic, when you can do better?  Go for it!
    >
    
        We have a powerful parser. So we can provide
    
            ... [ LIMIT { rows | ALL } ] [ OFFSET skip ]
    
            or
    
            ... [ LIMIT [ skip , ] { rows | ALL } ]
    
        at the same time.
    
    
    Jan
    
    --
    
    #======================================================================#
    # It's easier to get forgiveness for being wrong than for being right. #
    # Let's break this rule - forgive me.                                  #
    #======================================== jwieck@debis.com (Jan Wieck) #
    
    
    
    
  7. Re: [HACKERS] SELECT ... LIMIT (trial implementation)

    Jan Wieck <jwieck@debis.com> — 1998-10-18T20:44:15Z

    >     We have a powerful parser. So we can provide
    > [...]
    
        This version now accepts all of the following
    
            ... [ LIMIT rows ] [ OFFSET skip ]
            ... [ OFFSET skip ] [ LIMIT rows ]
            ... [ LIMIT [ skip , ] rows ]
    
        rows  can be a positive integer constant greater that 0, a $n
        parameter (in SPI_prepare()) or  the  keyword  ALL.  0  isn't
        accepted  as  constant to force ALL in that case making clear
        that this is wanted. In the  parameter  version  the  integer
        value 0 still is used to mean ALL.
    
        skip can be a positive integer constant greater or equal to 0
        or a $n parameter for SPI_prepare.
    
        If any of these syntaxes is used  in  SPI_prepare()'d  plans,
        the  given tcount argument for SPI_execp() is ignored and the
        plan or parameter values are used.
    
        Anyone happy now?
    
    
    Jan
    
    --
    
    #======================================================================#
    # It's easier to get forgiveness for being wrong than for being right. #
    # Let's break this rule - forgive me.                                  #
    #======================================== jwieck@debis.com (Jan Wieck) #
    
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