频率泄露
在上课学习时，实在没有听懂其具体含义，通过一些资料补充一些个人理解。（理解可能存在偏差，欢迎指正）这部分可能偏理解一些，课后作业也没有涉及
产品开发 topic 7
产品开发Topic 7 – System Level Design
产品开发 topic 6
产开的小总结
Database note
Database1.Overview of Data Models1.1.关系数据模型（Relational Model）
A two-dimensional table called a relation
Each relation has a name——关系名
Provides a simple, limited approach to structuring data
Provides a limited, yet useful, collection of operations on data
1.1.1.Attribute(属性)The columns of a relation are named by attributes
Any two attributes of a relation can’t have same name
第一行就是每列的attribute
1.1.2.Schemas(模式)
Relation schema = relation nameand the set ...
安装Mysql
安装MySQL简单记录
