Re: Weird sorting order

It's ignoring the hash marks. It's like they are invisible characters.
Tested on 8.1.16

-------- Original Message --------
Subject: [ADMIN] Weird sorting order
Date: Fri, 16 Jul 2010 15:14:09 +0300
From: Robert Voinea <robert.voinea@topex.ro>
Organization: Topex
To: pgsql-admin@postgresql.org

Hi...

I have the following table:

CREATE TABLE test
(
    id SERIAL PRIMARY KEY,
    val VARCHAR(32) NOT NULL
);

INSERT INTO test VALUES
    (DEFAULT, '##34''),
    (DEFAULT, '##32'),
    (DEFAULT, '##31'),
    (DEFAULT, '2ff'),
    (DEFAULT, '##26'),
    (DEFAULT, '2##33'),
    (DEFAULT, '2##25'),
    (DEFAULT, '2##24'),
    (DEFAULT, '2##23'),
    (DEFAULT, '211'),
    (DEFAULT, '210'),
    (DEFAULT, '203'),
    (DEFAULT, '202'),
    (DEFAULT, '201'),
    (DEFAULT, '200');

Why is it that when running the query:

SELECT * FROM test ORDER BY val;

I get the following result?
  id |  val
----+-------
   1 | 200
   2 | 201
   3 | 202
   4 | 203
   5 | 210
   6 | 211
   7 | 2##23
   8 | 2##24
   9 | 2##25
  10 | 2##33
  11 | ##26
  12 | 2ff
  13 | ##31
  14 | ##32
  15 | ##34
(15 rows)

Shouldn't value '2ff' be placed right after '211' but before '2##23'?

Tested on PostgreSQL 8.2, 8.4, Linux SuSE & Kubuntu.

Thank you!...


--
Robert Voinea <robert (dot) voinea (at) topex (dot) ro>
Software Developer
Phone: +40 21 408 38 00 / ext. 343
Fax: +40 21 408 38 08
Local time: GMT+2
http://www.topex.ro


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