本文主要内容:显示表中多有的索引show all index添加索引ADD INDEX, 添加唯一索引add unique index多列联合添加索引,primary key关键词index vs keyshow all indexshow index from tb_name 例如:1show index from springdemo.blog;添加索引ADD INDEX, 添加唯一索引add unique index123ALTER TABLE `table` ADD INDEX `product