20 years of US mine safety data (MSHA): Python ETL, PostgreSQL star schema, exposure-adjusted KPIs and a Power BI report. HSE + Data Analytics. This is a repo that details how I created a report ...
3. Avoid insertion, update and deletion anomalies. 4. Make the database easier to maintain.
本内容遵循CC 4.0 BY-SA版权协议 很多刚接触数据库的开发者会有个疑问：范式是不是学院派搞出来的理论，实际开发中真的用得上吗？我在早年的项目里也这么想过，直到接手过一个历史遗留系统 ...
Em difference between 1nf 2nf 3nf bcnf 4nf 5nf, o foco da descricao deve estar na experiencia real do usuario: carregamento, controles, clareza dos resultados, compatibilidade com Android e iOS e ...
做数据库相关工作，范式这个概念基本绕不开。面试被问、课程设计被考、设计表结构时被同事甩一句“你这表不符合3NF”，都是常有的事。如果你去搜“三范式”或者“3NF”，能搜出一堆教科 ...
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