Database- Nested Queries - Using Join and operation, Running Total

Retrieve data from two different websites, loading them into the PostgreSQL database using Python, and combine them to get and present new information

Query from Schema

一套基于 MySQL 的 SQL 语句练习记录项目，包含建库建表、测试数据、基础查询、聚合统计、JOIN 连接查询、子查询、事务、视图、索引等练习内容，并给每条 SQL 运行结果展示了截图，方便系统学习和复盘。