Using Auto-Increment value in MYSQL Before Insert Trigger?

Question

The users table:

CREATE TABLE `users` (
  `id` int(8) unsigned NOT NULL AUTO_INCREMENT,
  `email` varchar(45) DEFAULT NULL,
  `username` varchar(16) DEFAULT          


        

Answer 1

PLEASE USE AFTER INSERT AND UPDATE

Do not make auto_increment any column you want to manipulate explicitly. That can confuse an engine and cause serious problems. If no column you have used for primary key are auto_increment you can do anything you want with them via triggers. Sure generated values will be rejected if they violate the mandatory uniqness of the primary key.