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请问新建表时，这个 KEY 表示什么？
- WBOYOriginal
- 2016-06-23 13:53:44925browse
CREATE TABLE `users` ( `id` int(11) NOT NULL auto_increment, `yhm` varchar(20) NOT NULL, `mm` varchar(50) default NULL, `wt` varchar(20) NOT NULL, PRIMARY KEY (`id`), KEY `yhm` (`yhm`)) ENGINE=MyISAM
KEY `yhm` (`yhm`) ------ 请问这一句是做什么用的？
回复讨论(解决方案)
KEY `yhm` (`yhm`) 是索引
index 索引。
PRIMARY KEY (`id`), 主?
KEY `yhm` (`yhm`) 普通索引
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