凌少

摘要： 1，删除原有主键：ALTER TABLE `table_name` DROP `id`;2，添加新主键字段：ALTER TABLE `table_name` ADD `id` MEDIUMINT( 8 ) NOT NULL FIRST;3，设置新主键：ALTER TABLE `table_name` MODIFY COLUMN `id` MEDIUMINT( 8 ) NOT NULL AUTO_INCREMENT,ADD PRIMARY KEY(id); 阅读全文