在规范化过程中是否存在创建非规范化表的实践/指南？

I started to teach myself the basics of databases and i am currently working through 1. to 3. normal forms. What i understand until now is the wish to remove redundancy to make my databases less prone to inconsistency during phases of data-change as well as saving space by eliminating as much duplicates as possible. I started to teach myself the basics of databas