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 <mysql-thread83771@stripped>
> To unsubscribe, e-mail
> <mysql-unsubscribe-gerald_clark=suppliersystems.com@stripped>
> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
--
Gerald L. Clark
gerald_clark@stripped
