1. The development process and difference of the three
https://www.zhihu.com/question/19866767
2. Basics of T-SQL programming
https://blog.csdn.net/weixin_44870681/article/details/99666362?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522158597073919724811824773%2522%252C%2522scm%2522%253A%252220140713.130056874..%2522%257D&request_id=158597073919724811824773&biz_id=0&utm_source=distribute.pc_search_result.none-task-blog-all_SOOPENSEARCH-2
3. The difference between T-Sql, sql, pl-sql
https://www.cnblogs.com/zgx/archive/2011/08/22/2149810.html
4. Cloud Database
Cloud computing + database
1. Google
includes the file system Google File System built on the cluster, the distributed programming environment Map / Reduce, the distributed lock mechanism Chubby and the large-scale distributed database BigTable simplified by the model developed by Google
5. Non-relational database, redis
