Hadoop权威指南的Github
https://github.com/tomwhite/hadoop-book
刷SQL题网站
https://sqlzoo.net/wiki/SELECT_basics
https://blog.csdn.net/flycat296/article/details/63681089
刷题or源码链接
原文：https://www.cnblogs.com/hdc520/p/11012831.html
