What Is ETL?
https://www.sas.com/en_us/insights/data-management/what-is-etl.html
ETL讲解
https://www.cnblogs.com/yjd_hycf_space/p/7772722.html
ETL方法与过程讲解
https://blog.csdn.net/bcqtt/article/details/51757725
ETL的经验总结
https://www.cnblogs.com/Asatic/p/4905017.html
关于ETL，一个有意思的比喻
https://blog.csdn.net/tuyi541601377/article/details/41011275
几款开源的ETL工具及ELT初探
http://bigdata.51cto.com/art/201702/530998.htm
ETL Wikipedia
https://zh.wikipedia.org/wiki/ETL
开源ETL工具-kettle初识
https://zhuanlan.zhihu.com/p/24835051
