[大数据]MySQL全值匹配

准备环境

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create table `tb_seller` (
	`sellerid` varchar (100),
	`name` varchar (100),
	`nickname` varchar (50),
	`password` varchar (60),
	`status` varchar (1),
	`address` varchar (100),
	`createtime` datetime,
    primary key(`sellerid`)
)engine=innodb default charset=utf8mb4; 

insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('alibaba','阿里巴巴','阿里小店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('baidu','百度科技有限公司','百度小店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('huawei','华为科技有限公司','华为小店','e10adc3949ba59abbe56e057f20f883e','0','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('itcast','传智播客教育科技有限公司','传智播客','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('itheima','黑马程序员','黑马程序员','e10adc3949ba59abbe56e057f20f883e','0','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('luoji','罗技科技有限公司','罗技小店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('oppo','OPPO科技有限公司','OPPO官方旗舰店','e10adc3949ba59abbe56e057f20f883e','0','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('ourpalm','掌趣科技股份有限公司','掌趣小店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('qiandu','千度科技','千度小店','e10adc3949ba59abbe56e057f20f883e','2','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('sina','新浪科技有限公司','新浪官方旗舰店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('xiaomi','小米科技','小米官方旗舰店','e10adc3949ba59abbe56e057f20f883e','1','西安市','2088-01-01 12:00:00');
insert into `tb_seller` (`sellerid`, `name`, `nickname`, `password`, `status`, `address`, `createtime`) values('yijia','宜家家居','宜家家居旗舰店','e10adc3949ba59abbe56e057f20f883e','1','北京市','2088-01-01 12:00:00');


create index idx_seller_name_sta_addr on tb_seller(name,status,address);

避免索引失效

1). 全值匹配 ，对索引中所有列都指定具体值。

改情况下，索引生效，执行效率高。

explain select * from tb_seller where name='小米科技' and status='1' and address='北京市'\G;