Re: [PHP-DB] Really dumb question... deleting everything but newest100 rows?

2002-11-23 Thread Marco Tabini
If you have a column that gives you the newness of each row--I'm
assuming a date here:

delete from my_table order by date_inserted desc limit 100, -1


This should work... I recommend a db backup first :-)


Marco


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On Sat, 2002-11-23 at 17:38, Leif K-Brooks wrote:
 I know this is a dumb question, but how would I delete everything but 
 the first 100 results returned from a query?  I know I'd use limit, but 
 my mind's going blank as to the exact syntax.
 
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Re: [PHP-DB] Really dumb question... deleting everything but newest100 rows?

2002-11-23 Thread Leif K-Brooks
I was thinking something along those lines, but phpmyadmin gives an 
error.  The table currently has way too many rows (32362), could this 
have to do with it?

Warning: Unable to jump to row 0 on MySQL result index 4 in 
/home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php on line 223

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/libraries/ob.lib.php 
on line 53

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 23

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 24

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 25

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 26

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 27

Warning: Cannot add header information - headers already sent by (output 
started at /home/virtual/site1/fst/var/www/html/PhpMyAdmin/sql.php:223) 
in /home/virtual/site1/fst/var/www/html/PhpMyAdmin/header.inc.php on line 29


 Database mydb running on localhost

Error

SQL-query : 

delete from `mytable` order by col desc limit 100, -1

MySQL said:

You have an error in your SQL syntax near 'order by col desc limit 100, -1' at line 1

Back 
http://www.ecritters.biz/PhpMyAdmin/db_details.php?lang=enserver=1db=chizzy_co_ukshow_query=ysql_query=delete+from+%60topics%60+order+by+id+desc+limit+100%2C+-1

Marco Tabini wrote:

If you have a column that gives you the newness of each row--I'm
assuming a date here:

delete from my_table order by date_inserted desc limit 100, -1


This should work... I recommend a db backup first :-)


Marco


php|architect - The magazine for PHP Professionals
The monthly worldwide magazine dedicated to PHP programmers
Check us out on the web at http://www.phparch.com

On Sat, 2002-11-23 at 17:38, Leif K-Brooks wrote:
 

I know this is a dumb question, but how would I delete everything but 
the first 100 results returned from a query?  I know I'd use limit, but 
my mind's going blank as to the exact syntax.

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