MYSQL創建唯一索引

MYSQL創建唯一索引

創建表時直接設置:

DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`stu_id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`stu_id`),
UNIQUE KEY `UK_student_name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

創建唯一索引:

create unique index UK_student_name on student (name);

建表後添加約束:

alter table student add constraint uk_student_name unique (name);