MySQL聚集索引与非聚集索引

聚集索引与非聚集索引

 参考链接：

http://blog.sina.com.cn/s/blog_d13b2a8f0102wlj8.html

http://jingyan.baidu.com/article/e73e26c0f1e82d24acb6a75d.html

http://www.cnblogs.com/lwzz/archive/2012/08/05/2620824.html

http://blog.codinglabs.org/articles/theory-of-mysql-index.html