Re: [PHP-DB] mySQL Query and blank fields
On Thursday 25 October 2001 15:08, Rick Emery wrote: > First, I wouldn't use length(), I'd use REGEXP: SELECT * FROM > foo_table WHERE fieldname REGEXP '..+' > It's quicker. regular expression is faster then a length() call? that's seems strange considering how complex a regexp can be with regexp, it takes 0.13sec on a simple table with lenght it is 0.08sec. Arpi -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
Try: UPDATE mytable SET myfield=CONCAT( LEFT(myfield,LENGTH(myfield)-1),'new_string') WHERE some_condition If you know the field will ALWAYS be the same length (for instance 5, and you wish to replace the 5th character): UPDATE mytable SET myfield=CONCAT(LEFT(myfield,4),'new_char') WHERE some_condition -Original Message- From: Niklas Lampén [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:37 AM To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields I'd like to do it in mySQL, I think it will be done much quicker since it a large database. The type of the field is allready varchar. Niklas -Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 16:08 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields First, I wouldn't use length(), I'd use REGEXP: SELECT * FROM foo_table WHERE fieldname REGEXP '..+' It's quicker. As far as the second question, do you wish to do it in PHP or MySQL? Does the value in MySQL require other computations (so, it must remain numeric) or can it be a CHAR string? -Original Message- From: Niklas Lampén [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:04 AM To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Thanks a lot! I quite didn't know what to look for in the manual. I actually have another question: If I want to update several fields, add a number to the end of the fields value, how do I do that? I have field with value '9876' and if I do "...field=field+'5'..." the value turns into '9881' not '98765' as I expected. Niklas -Original Message----- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 15:56 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
I'd like to do it in mySQL, I think it will be done much quicker since it a large database. The type of the field is allready varchar. Niklas -Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 16:08 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields First, I wouldn't use length(), I'd use REGEXP: SELECT * FROM foo_table WHERE fieldname REGEXP '..+' It's quicker. As far as the second question, do you wish to do it in PHP or MySQL? Does the value in MySQL require other computations (so, it must remain numeric) or can it be a CHAR string? -Original Message- From: Niklas Lampén [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:04 AM To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Thanks a lot! I quite didn't know what to look for in the manual. I actually have another question: If I want to update several fields, add a number to the end of the fields value, how do I do that? I have field with value '9876' and if I do "...field=field+'5'..." the value turns into '9881' not '98765' as I expected. Niklas -Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 15:56 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
First, I wouldn't use length(), I'd use REGEXP: SELECT * FROM foo_table WHERE fieldname REGEXP '..+' It's quicker. As far as the second question, do you wish to do it in PHP or MySQL? Does the value in MySQL require other computations (so, it must remain numeric) or can it be a CHAR string? -Original Message- From: Niklas Lampén [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:04 AM To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Thanks a lot! I quite didn't know what to look for in the manual. I actually have another question: If I want to update several fields, add a number to the end of the fields value, how do I do that? I have field with value '9876' and if I do "...field=field+'5'..." the value turns into '9881' not '98765' as I expected. Niklas -Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 15:56 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] mySQL Query and blank fields
>I have field with value '9876' and if I do "...field=field+'5'..." the >value turns into '9881' not '98765' as I expected. make your field type "var char" - Original Message - From: "Niklas Lampén" <[EMAIL PROTECTED]> To: "Php-DB" <[EMAIL PROTECTED]> Sent: Thursday, October 25, 2001 3:03 PM Subject: RE: [PHP-DB] mySQL Query and blank fields Thanks a lot! I quite didn't know what to look for in the manual. I actually have another question: If I want to update several fields, add a number to the end of the fields value, how do I do that? I have field with value '9876' and if I do "...field=field+'5'..." the value turns into '9881' not '98765' as I expected. Niklas -----Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 15:56 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -----Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
Thanks a lot! I quite didn't know what to look for in the manual. I actually have another question: If I want to update several fields, add a number to the end of the fields value, how do I do that? I have field with value '9876' and if I do "...field=field+'5'..." the value turns into '9881' not '98765' as I expected. Niklas -Original Message- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: 25. lokakuuta 2001 15:56 To: Php-DB Subject: RE: [PHP-DB] mySQL Query and blank fields Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
Change that to: SELECT * FROM foo_table WHERE length(bar_field)>1; -Original Message- From: Tamas Arpad [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 8:01 AM To: Niklas Lampén; Php-DB Subject: Re: [PHP-DB] mySQL Query and blank fields On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] mySQL Query and blank fields
On Thursday 25 October 2001 13:16, Niklas Lampén wrote: > How can I query for specified fields that has to contain atleast 2 > charters? SELECT * FROM foo_table WHERE length(bar_field)>=1; Arpi > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] mySQL Query and blank fields
REGEXP '..+' -Original Message- From: Niklas Lampén [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 6:17 AM To: Php-DB Subject: [PHP-DB] mySQL Query and blank fields How can I query for specified fields that has to contain atleast 2 charters? Example: Field AAA contains '' (NULL) => No match Field BBB contains ' ' (one charter) => No match Field CCC contains 'ab' => Match Field DDD contains 'abcdefg' => Match Niklas -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] mySQL Query and blank fields
Assuming you're using MySQL - 35 seconds is all it took to find: http://www.mysql.com/doc/P/a/Pattern_matching.html Good luck! Russ. On Thu, 25 Oct 2001 14:16:40 +0300 =?iso-8859-1?Q?Niklas_Lamp=E9n?= <[EMAIL PROTECTED]> wrote: > How can I query for specified fields that has to contain atleast 2 > charters? > > Example: > Field AAA contains '' (NULL) => No match > Field BBB contains ' ' (one charter) => No match > Field CCC contains 'ab' => Match > Field DDD contains 'abcdefg' => Match > > > Niklas #---# "Believe nothing - consider everything" Russ Michell Anglia Polytechnic University Webteam Room 1C 'The Eastings' East Road, Cambridge e: [EMAIL PROTECTED] w: www.apu.ac.uk/webteam www.theruss.com #---# -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP-DB] mySQL Query and blank fields
How can I query for specified fields that has to contain atleast 2 charters? Example: Field AAA contains '' (NULL) => No match Field BBB contains ' ' (one charter) => No match Field CCC contains 'ab' => Match Field DDD contains 'abcdefg' => Match Niklas
