Describe the relationship between ANSI SQL and GSP library
A digital copy of SQL-99 Complete, Really.
After push to this repo, document will be automatically generated under:
https://sql-gsp.readthedocs.io/en/latest/
准备在本地搭建环境，可以在本地创建html文档。
backup目录是原始docs目录的备份，docs目录的文件根据本项目需要会被删除、更改。
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