学习笔记数据库范式的相关内容

文章 2022-12-29 来自：开发者社区

[学习笔记] 数据库设计三大范式与 BCNF，学习笔记

参考：1. 范式间的区别http://www.cnblogs.com/winlinglin/archive/2008/11/19/1336337.html2. 数据库范式 1NF 2NF 3NF BCNFhttp://dev.firnow.com/course/7_databases/sql/sqlServer/20090502/166234.html3. 萨师煊 & 王珊《数据库系统概....

文章 2022-06-13 来自：开发者社区

MySQL学习笔记汇总（五）——索引、视图、数据库设计三范式

一、索引索引被用来快速找出在一个列上用一特定值的行。没有索引，MySQL 不得不首先以第一条记录开始，然后读完整个表直到它找出相关的行。表越大，花费时间越多。添加索引是给某一个字段，或者说某些字段添加索引。什么时候考虑给字段添加索引数据量庞大。（根据客户的需求，根据线上的环境）该字段很少的DML操作。（因为字段进行修改操作，索引也需要维护）该字段经常出现在where子句中。（经常根据哪个字段查....

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