文章目录

• MySQL之MyIsam索引
• • 1.MyIsam索引介绍
  • 2.演示(单列主键索引、等值查询、范围查询)

MySQL之MyIsam索引

1.MyIsam索引介绍

2.演示(单列主键索引、等值查询、范围查询)

CREATE TABLE `user`
(
  `id`       int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(20) DEFAULT NULL,
  `age`      int(11)     DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE,
  KEY `idx_age` (`age`) USING BTREE
) ENGINE = MyISAM
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8;

select * from user where id = 28;

select * from user where id between 28 and 47;