Groups > comp.databases.postgresql > #232

Re: Case-insensitive select

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From	Mladen Gogala <gogala.mladen@gmail.com>
Newsgroups	comp.databases.postgresql
Subject	Re: Case-insensitive select
Date	Mon, 5 Sep 2011 10:53:28 +0000 (UTC)
Organization	solani.org
Lines	42
Message-ID	<pan.2011.09.05.10.53.26@gmail.com> (permalink)
References	<25ee8bf2-869c-427b-a4a4-5faf86f92d57@o26g2000vbi.googlegroups.com> <WS*So6Lt@news.chiark.greenend.org.uk> <pan.2011.08.31.23.00.27@gmail.com> <1314860211.105064@proxy.dienste.wien.at> <pan.2011.09.01.12.57.52@gmail.com> <1314888079.999065@proxy.dienste.wien.at> <pan.2011.09.01.21.26.13@gmail.com> <1314950920.382293@proxy.dienste.wien.at> <pan.2011.09.02.13.03.56@gmail.com> <1315208734.245902@proxy.dienste.wien.at>
Mime-Version	1.0
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	8bit
X-Trace	solani.org 1315220008 14154 eJwFwYEBwCAIA7CXQGmZ52CR/09Ygk2nMggGBtNHps3iscyBPOSGdlpHrZzvjVSItnVv2fsBGw4Rew== (5 Sep 2011 10:53:28 GMT)
X-Complaints-To	abuse@news.solani.org
NNTP-Posting-Date	Mon, 5 Sep 2011 10:53:28 +0000 (UTC)
User-Agent	Pan/0.133 (House of Butterflies)
X-User-ID	eJwFwYEBgDAIA7CXYJQ6zwGk/59gkkHnPGASqdT6+FwBjZUNPVGtuX1YBdixiY1sdQff/X4uYBHa
Cancel-Lock	sha1:iNRyuSDHw9zM6a+9qxGfyPKoPY8=
X-NNTP-Posting-Host	eJwFwQkBwDAIA0BLPE0AOWUU/xJ2B6fyi0PwYLGHs+3mNi1vAXDU7iudTUdHj92qtpLVPpcdCXnl+bwlkWDIiM1HvbqVP9YFGZg=
Xref	x330-a1.tempe.blueboxinc.net comp.databases.postgresql:232

Show key headers only | View raw

On Mon, 05 Sep 2011 09:45:13 +0200, Laurenz Albe wrote:

> 
> Why do you claim that without a test? This is PostgreSQL 9.1:
> 
> CREATE TABLE test(id serial primary key, val varchar(20) NOT NULL);
> 
> DO $$BEGIN
>    FOR i IN 1..10000 LOOP
>       INSERT INTO test(val) VALUES (substr(random()::text, 3));
>    END LOOP;
> END;$$;
> 
> CREATE INDEX test_val_ind ON test(lower(val));
> 
> SHOW default_statistics_target;
> 
>  default_statistics_target
> ---------------------------
>  100
> (1 row)
> 
> ANALYZE test;
> 
> SELECT array_length(histogram_bounds, 1) FROM pg_stats
>    WHERE tablename = 'test_val_ind';
> 
>  array_length
> --------------
>           101
> (1 row)
> 
> Yours,
> Laurenz Albe

I don't understand? What does this prove? That there is a histogram on 
lower(val)? How does your example prove that? 



-- 
http://mgogala.byethost5.com

Back to comp.databases.postgresql | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Case-insensitive select RVince <rvince99@gmail.com> - 2011-08-31 05:29 -0700
  Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-08-31 13:19 +0000
  Re: Case-insensitive select Matthew Woodcraft <mattheww@chiark.greenend.org.uk> - 2011-08-31 20:42 +0100
    Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-08-31 23:00 +0000
      Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-01 08:56 +0200
        Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-09-01 12:57 +0000
          Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-01 16:40 +0200
            Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-09-01 21:26 +0000
              Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-02 10:08 +0200
                Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-09-02 13:03 +0000
                Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-05 09:45 +0200
                Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-09-05 10:53 +0000
                Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-05 16:13 +0200
                Re: Case-insensitive select Mladen Gogala <gogala.mladen@gmail.com> - 2011-09-06 02:21 +0000
              Re: Case-insensitive select "Laurenz Albe" <invite@spam.to.invalid> - 2011-09-02 10:08 +0200

csiph-web