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Merge pull request xingshaocheng#99 from Goook/patch-1
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Update README.md
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xingshaocheng authored Jun 28, 2019
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* [Protobuf](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#protobuf)
* [数据库](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#数据库)
* [基础理论](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#基础理论)
* [数据库设计的三大范式](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#数据库设计的三大范式)
* [关系数据库设计的三大范式](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#关系数据库设计的三大范式)
* [MySQL](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#mysql)
* [原理](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#原理)
* [InnoDB](https://github.com/xingshaocheng/architect-awesome/blob/master/README.md#innodb)
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# 数据库
## 基础理论
### 数据库设计的三大范式
### 关系数据库设计的三大范式
* [《数据库的三大范式以及五大约束》](https://www.cnblogs.com/waj6511988/p/7027127.html)
* 第一范式:数据表中的每一列(每个字段)必须是不可拆分的最小单元,也就是确保每一列的原子性;
* 第二范式(2NF):满足1NF后,要求表中的所有列,都必须依赖于主键,而不能有任何一列与主键没有关系,也就是说一个表只描述一件事情;
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