关系模型基于谓词逻辑和集合论，为数据库管理提供了坚实的数学基础。

A man may die, nations may rise and fall, but an idea lives on. Ideas have endurance without death.

Screw it, let's do it.

The foundation of every government is some principle or passion in the minds of the people.

我不是一个想成为明星的女孩，我只是一个唱歌的女孩。