Hello, I have some problems using character class matching (e.g. [:alpha:]).
For example I have a table:
CREATE TABLE re_test (text_column character varying (50) NOT NULL);
Notice, that there are some specific characters.
INSERT INTO re_test VALUES ('AŠDF');
INSERT INTO re_test VALUES ('AŠDF45'
On 09/28/2010 10:36 PM, Tarlika Elisabeth Schmitz wrote:
On Tue, 28 Sep 2010 11:34:31 +0100
"Oliveiros d'Azevedo Cristina" wrote:
- Original Message -
From: "Tarlika Elisabeth Schmitz"
To:
Sent: Monday, September 27, 2010 5:54 PM
Subject: Re: [SQL] identifying duplicates in table with
On Wed, 29 Sep 2010 10:40:03 +0200
Andreas Schmitz wrote:
> On 09/28/2010 10:36 PM, Tarlika Elisabeth Schmitz wrote:
>> On Tue, 28 Sep 2010 11:34:31 +0100
>> "Oliveiros d'Azevedo Cristina"
>> wrote:
>>
>>> - Original Message -
>>> From: "Tarlika Elisabeth Schmitz"
>>> To:
>>> Sent: Monda
Hallo Andreas,
I reduced the problem to the innermost query:
1) SELECT DISTINCT trainer_id, trainer_name FROM student
This results in a sequential table scan. Execution time 7500ms.
2) I created an INDEX ON (trainer_id, trainer_name). Then I had an index
scan instead, which still cost 7000ms.
2010/9/28 Eduardas Kazakas :
> Hello, I have some problems using character class matching (e.g. [:alpha:]).
>
> For example I have a table:
>
> CREATE TABLE re_test (text_column character varying (50) NOT NULL);
>
> Notice, that there are some specific characters.
>
> INSERT INTO re_test VALUES ('A
