Hi! On Oct 22, Moshe Gurvich wrote: > thank you very much; > > i'm using right now v3.23 as recommended for production servers, but > anyway.. > > now, using the way you suggested, will this work: > > DELETE FROM tasks > FROM tasks as t_child LEFT JOIN tasks as t_parent ON > t_child.parent_id=t_parent.task_id > WHERE t_parent.task_id IS NULL > > thanx :)
It won't work - note two FROM clauses. Multi-table deletes are available in 4.0 only. In 3.23, I'm afraid, you have to do it in application :-( > On Oct 22, Moshe Gurvich wrote: > > so what's the remedy? > > how to do this task in MySQL without using subselects? > > > > > delete from followups where task_id not in (select task_id from tasks) > > > > > Multi-table deletes (MySQL 4.0.0+) > > DELETE followups FROM followups LEFT JOIN tasks USING(task_id) WHERE > tasks.task_id IS NULL; > > Regards, > Sergei > > -- > MySQL Development Team > __ ___ ___ ____ __ > / |/ /_ __/ __/ __ \/ / Sergei Golubchik <[EMAIL PROTECTED]> > / /|_/ / // /\ \/ /_/ / /__ MySQL AB, http://www.mysql.com/ > /_/ /_/\_, /___/\___\_\___/ Osnabrueck, Germany > <___/ > > --------------------------------------------------------------------- > 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 > > > --- > Incoming mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.281 / Virus Database: 149 - Release Date: 9/18/2001 > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.281 / Virus Database: 149 - Release Date: 9/18/2001 > > > > --------------------------------------------------------------------- > 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 > Regards, Sergei -- MySQL Development Team __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Sergei Golubchik <[EMAIL PROTECTED]> / /|_/ / // /\ \/ /_/ / /__ MySQL AB, http://www.mysql.com/ /_/ /_/\_, /___/\___\_\___/ Osnabrueck, Germany <___/ --------------------------------------------------------------------- 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
