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Duplicate primary key when primary key is varchar

From: Tính Trương Xuân <tinh(dot)truong(at)evolus(dot)vn>
To: pgsql-jdbc(at)postgresql(dot)org
Subject: Duplicate primary key when primary key is varchar
Date: 2010-10-06 10:16:54
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc
I have a very interesting situation with my database schema (attached in
this message). But first you have to import this database script into your
psql -h localhost -p 5432 -U postgres -f /path/to/the/file.sql your_database

Note: this schema is virus/malware/rootkit free, you can check it for

In the State table, you will notice that there are two rows with the primary
key is AL (it's capital A and capital L). But when you select:
select * from state where code='AL'
There is only one row returned. You may guest that there are some spaces in
the primary key? Nope!
You can verify by this query:
select 'a'||code||'b' from state
You will see that there are two rows with the data as aALb. No space in

The same thing happened for a row in the Family with the code 1006 (it's
There are a couple of other rows in other table as well, but not all of

You may ask, how did I come up with this schema?
Basically, I am developing an reporting web application, there is an
external system exporting data files (in UTF-16 LE). Then I convert those
files into UTF-8 and use Hibernate to insert the data.
I know that there is something wrong with the encoding but there is some
wrong with PostgreSQL as well.
Here is the script I used to create the database
  WITH OWNER = postgres
       ENCODING = 'UTF8'
       TABLESPACE = pg_default
       LC_COLLATE = 'en_US.utf8'
       LC_CTYPE = 'en_US.utf8'
I'm using PostgreSQL 8.4.4 on ArchLinux 32bit kernel

Any input will be appreciated


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Next:From: Dave CramerDate: 2010-10-06 11:06:06
Subject: Re: Duplicate primary key when primary key is varchar
Previous:From: Oliver JowettDate: 2010-10-06 00:01:35
Subject: Re: [BUGS] Mapping Hibernate boolean to smallint(Postgresql)

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