Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
hey, following problem here: i have table with persons that have one location, if i delete the location for the location table, i don’t wont to lose the assigned persons. ive a entry in the location with the id=1 and the name is: “No location”. and that what I’m trying to do, but i fail!
ALTER TABLE `persons`
ADD CONSTRAINT `persons_ibfk_1` FOREIGN KEY (`location_id`)
REFERENCES `locations` (`id`) ON DELETE SET `location_id` = 1;
thanks!
Use
ON DELETE SET DEFAULT(and make 1 the default value), orON DELETE SET NULL.A third option is to manually set all ids to 1 before deleting.