Yes, and yes. They're both documented in the manual. http://www.mysql.com/doc/A/L/ALTER_TABLE.html http://www.mysql.com/doc/I/N/INSERT.html Steve Meyers
> -----Original Message----- > From: Tony [mailto:[EMAIL PROTECTED]] > Sent: Thursday, October 25, 2001 12:57 PM > To: [EMAIL PROTECTED] > Subject: Column data type conversion Q > > > Not sure if this post worked the first time (I never saw it come > in), so a > thousand pardons if this is a re-post. > ---------------------------------------------------- > I come from the school of hard knocks, and so it seems my MySQL > indoctrination is no exception. 2 million rows of 'varchar' data > must be the > least efficient type to sort by. > > I need to change a column data type from 'varchar(10)' to 'int' type. > > I created another table, with the changed data type on the one column. I > thought I read that nested selects were not supported by MySQL, but is it > possible to do something like this: > > insert into new_table values (select '__enter-some-sort-of-on-the-fly- > data-type-conversion-on-a-column-or-two__' from old_table); > > > Or, is there an ALTER TABLE command on the existing table. Surely, this > would take a long time on a couple million rows. I am running > MySQL 3.23.36 > and RedHat 7.1 (2.4.3-12) > > Kind regards, > Tony > > --botspeak: sql, query, database > > --------------------------------------------------------------------- > 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 > > --------------------------------------------------------------------- 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
