Tom Churm wrote: > hi, > > i have 2 questions that i badly need answered. i use phpmyadmin, but > any answers containing SQL syntax should work in this app... > > 1) > this should be simple but i don't know it. i use the following mysql > table field as the Key for my tables: > > "id int(10) unsigned NOT NULL auto_increment," > > now, when i have to clean up items in my tables, like when users have > sent off a .html form multiple times and i want to delete duplicate > submissions, how can i quickly & easily update all of the 'id' fields in > the entire table, to reflect the numeration change? > > now, using phpmyadmin, if i go in and delete a few entries, the id's > have gaps in them. You don't reorder them. The gaps remain. Besides, if the id is used in any other table, changing a value would be a serious data integrity issue. > > 2) > in a table i have a column called User. some people have entered things > into this table multiple times. how do i create a SELECT statement to > select > only those rows that have multiple Users? i need something like this > (but this > is wrong, of course): > > SELECT * FROM mail_form2 WHERE 'count(User) >1' > > many thanks from a newbie, > > tom > What things, besides user names, would people be entering here? If you are concerned about duplicate user names, add a unique index on this column, you can use 'ALTER IGNORE mail_form2 add unique (User)', but I'm not sure this is what you meant. > --------------------------------------------------------------------- > Before posting, please check: > http://www.mysql.com/manual.php (the manual) > http://lists.mysql.com/ (the list archive) > > To request this thread, e-mail <[EMAIL PROTECTED]> > To unsubscribe, e-mail ><[EMAIL PROTECTED]> > Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php -- Gerald L. Clark [EMAIL PROTECTED] --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
