There is only one boss. The customer. And he can fire everybody in the company from the chairman on down, simply by spending his money somewhere else.

Sustainability isn't a trend, it's a necessity.

We are all searching for something, but we don't always know what it is.

I'm not afraid of storms, for I'm learning how to sail my ship.

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。