"Sometimes you have to be apart from people you love, but that doesn't make you love them any less. Sometimes you love them more."
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。
Every day is a new opportunity to change your life.
最伟大的发现往往在你没有刻意寻找时出现。