RE: [PHP] order by ASC
On Tue, 2010-01-19 at 16:16 -0800, Daevid Vincent wrote: http://www.webdeveloper.com/forum/showthread.php?t=101174 You could do it like this too... ORDER BY `rollnumber` + 0 ASC And if you just got the data out in mysql (no ORDER BY -- which can be slow in mysql), you could use PHP's sort as well... http://php.net/manual/en/function.natsort.php -Original Message- From: Robert Cummings [mailto:rob...@interjinn.com] Sent: Saturday, January 16, 2010 9:37 PM To: John Taylor-Johnston Cc: PHP-General Subject: Re: [PHP] order by ASC John Taylor-Johnston wrote: Did some googling. This worked: ORDER BY CAST(`rollnumber` AS SIGNED) What is the difference? My problem in the meanwhile must be my version of MySQL? You could have skipped quotes altogether. The difference is that you are referencing a field name, not a string value. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php I've always found that ordering is much faster in MySQL than PHP. You use quite a lot of memory sorting in PHP as well, as you first have to load the whole result set into an array, which is additional to any memory used in the result set by PHP and MySQL anyway. Thanks, Ash http://www.ashleysheridan.co.uk
RE: [PHP] order by ASC
http://lmgtfy.com/?q=mysql+order+by+slow it's notoriously slow to use ORDER BY with large tables. Mainly b/c mySQL has to use a hash/temp table to re-sort AFAIK. I wasn't thinking of sorting the whole set, only the list of numbers as the OP only talked about sorting a single column... rollnumber is a varchar(50). I need it to be a text field. ASC does not order the way I want. 1000 1001 998 999 I want it to order like this: 998 999 1000 1001 _ From: Ashley Sheridan [mailto:a...@ashleysheridan.co.uk] Sent: Tuesday, January 19, 2010 4:40 PM To: Daevid Vincent Cc: 'PHP-General' Subject: RE: [PHP] order by ASC On Tue, 2010-01-19 at 16:16 -0800, Daevid Vincent wrote: http://www.webdeveloper.com/forum/showthread.php?t=101174 You could do it like this too... ORDER BY `rollnumber` + 0 ASC And if you just got the data out in mysql (no ORDER BY -- which can be slow in mysql), you could use PHP's sort as well... http://php.net/manual/en/function.natsort.php -Original Message- From: Robert Cummings [mailto:rob...@interjinn.com] Sent: Saturday, January 16, 2010 9:37 PM To: John Taylor-Johnston Cc: PHP-General Subject: Re: [PHP] order by ASC John Taylor-Johnston wrote: Did some googling. This worked: ORDER BY CAST(`rollnumber` AS SIGNED) What is the difference? My problem in the meanwhile must be my version of MySQL? You could have skipped quotes altogether. The difference is that you are referencing a field name, not a string value. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php I've always found that ordering is much faster in MySQL than PHP. You use quite a lot of memory sorting in PHP as well, as you first have to load the whole result set into an array, which is additional to any memory used in the result set by PHP and MySQL anyway. Thanks, Ash http://www.ashleysheridan.co.uk
RE: [PHP] order by ASC
On Tue, 2010-01-19 at 17:11 -0800, Daevid Vincent wrote: http://lmgtfy.com/?q=mysql+order+by+slow it's notoriously slow to use ORDER BY with large tables. Mainly b/c mySQL has to use a hash/temp table to re-sort AFAIK. I wasn't thinking of sorting the whole set, only the list of numbers as the OP only talked about sorting a single column... rollnumber is a varchar(50). I need it to be a text field. ASC does not order the way I want. 1000 1001 998 999 I want it to order like this: 998 999 1000 1001 _ From: Ashley Sheridan [mailto:a...@ashleysheridan.co.uk] Sent: Tuesday, January 19, 2010 4:40 PM To: Daevid Vincent Cc: 'PHP-General' Subject: RE: [PHP] order by ASC On Tue, 2010-01-19 at 16:16 -0800, Daevid Vincent wrote: http://www.webdeveloper.com/forum/showthread.php?t=101174 You could do it like this too... ORDER BY `rollnumber` + 0 ASC And if you just got the data out in mysql (no ORDER BY -- which can be slow in mysql), you could use PHP's sort as well... http://php.net/manual/en/function.natsort.php -Original Message- From: Robert Cummings [mailto:rob...@interjinn.com] Sent: Saturday, January 16, 2010 9:37 PM To: John Taylor-Johnston Cc: PHP-General Subject: Re: [PHP] order by ASC John Taylor-Johnston wrote: Did some googling. This worked: ORDER BY CAST(`rollnumber` AS SIGNED) What is the difference? My problem in the meanwhile must be my version of MySQL? You could have skipped quotes altogether. The difference is that you are referencing a field name, not a string value. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php I've always found that ordering is much faster in MySQL than PHP. You use quite a lot of memory sorting in PHP as well, as you first have to load the whole result set into an array, which is additional to any memory used in the result set by PHP and MySQL anyway. Thanks, Ash http://www.ashleysheridan.co.uk I had a look at some of the results from that link to Google, but I didn't see anything indicating MySQL was slower at ordering than PHP, only that MySQL has issues ordering very large query sets on queries that it cannot use an index to order on. I've tried optimising ordering in both PHP and MySQL, and found that usually it's best to leave as much to the database as possible, unless the ordering becomes too complex. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] order by ASC
John Taylor-Johnston wrote:
Ok, I think this is a MySQl question. Take pity on me?
$sql = SELECT * FROM $db.`mailinglist` WHERE `type` IN ('Member',
'Affiliated', 'Life Member') ORDER BY `rollnumber` ASC;
rollnumber is a varchar(50). I need it to be a text field. ASC does not
order the way I want.
1000
1001
998
999
I want it to order like this:
998
999
1000
1001
How do I trick it? I cannot think of a way in MySQL. Is there a way in PHP?
CAST it to an integer in the ORDER BY clause.
Cheers,
Rob.
--
http://www.interjinn.com
Application and Templating Framework for PHP
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Re: [PHP] order by ASC
It hates me:
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST(rollnumber AS int)
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST(`rollnumber` AS int)
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST('rollnumber' AS int)
You have an error in your SQL syntax; check the manual that corresponds
to your MySQL server version for the right syntax to use near 'int) ASC'
at line 1
I'll keep trying.
Robert Cummings wrote:
CAST it to an integer in the ORDER BY clause.
Cheers,
Rob.
John Taylor-Johnston wrote:
Ok, I think this is a MySQl question. Take pity on me?
$sql = SELECT * FROM $db.`mailinglist` WHERE `type` IN ('Member',
'Affiliated', 'Life Member') ORDER BY `rollnumber` ASC;
rollnumber is a varchar(50). I need it to be a text field. ASC does
not order the way I want.
1000
1001
998
999
I want it to order like this:
998
999
1000
1001
How do I trick it? I cannot think of a way in MySQL. Is there a way
in PHP?
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] order by ASC
Did some googling. This worked:
ORDER BY CAST(`rollnumber` AS SIGNED)
What is the difference? My problem in the meanwhile must be my version
of MySQL?
John Taylor-Johnston wrote:
It hates me:
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST(rollnumber AS int)
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST(`rollnumber` AS int)
SELECT * FROM ... WHERE `type` IN ('Member', 'Affiliated', 'Life
Member') ORDER BY CAST('rollnumber' AS int)
You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'int) ASC' at line 1
I'll keep trying.
Robert Cummings wrote:
CAST it to an integer in the ORDER BY clause.
Cheers,
Rob.
John Taylor-Johnston wrote:
Ok, I think this is a MySQl question. Take pity on me?
$sql = SELECT * FROM $db.`mailinglist` WHERE `type` IN ('Member',
'Affiliated', 'Life Member') ORDER BY `rollnumber` ASC;
rollnumber is a varchar(50). I need it to be a text field. ASC does
not order the way I want.
1000
1001
998
999
I want it to order like this:
998
999
1000
1001
How do I trick it? I cannot think of a way in MySQL. Is there a way
in PHP?
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] order by ASC
John Taylor-Johnston wrote: Did some googling. This worked: ORDER BY CAST(`rollnumber` AS SIGNED) What is the difference? My problem in the meanwhile must be my version of MySQL? You could have skipped quotes altogether. The difference is that you are referencing a field name, not a string value. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
