EXPLAIN 命令详解
http://www.cnblogs.com/gomysql/p/3720123.html
http://www.cnblogs.com/Aiapple/p/5697229.html
http://www.cnblogs.com/xuanzhi201111/p/4175635.html
https://dev.mysql.com/doc/refman/5.7/en/optimization.html
Mysql 执行计划（Explain） 说明
http://blog.csdn.net/tianlesoftware/article/details/7043794
mysql optimization
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