bachelor-project cityu cs3103 cs3201 cs3391 cityuniversityofhongkong cs4386 cs2204 cs2312 cs3334 cs2310 cs2115 cs3343 cs3402 cs4186 cs4286 cs4293 cs4486 cs4487 Updated Oct 28, 2023 Jupyter Notebook mojimoon / CityU-CS Star 13 Code Issues Pull requests The code and notes for Co...
CS3402 Integrity Constraints Integrity Constraints Motivation To ensure that changes (made by authorized users) to the database do not cause a loss of consistency Constraints are conditions that must hold on all valid relation instances. In general, an integrity constraint (IC) can be an arbitrary...
Database Management System (DBMS) Characteristics DBMS provides efficient, reliable, convenient and safe multi-user storage of and access to a massive amount of persistent data. Massive: TB Scale Persistent: Like file systems Safe: No loss of data Multi-user: Concurrency Convenient: Easy to extrac...
The purpose of this study was to explore the nature of explanations used by science teachers in junior high school classrooms. Studies on explanation in ed... Z Dagher,G Cossman - 《Journal of Research in Science Teaching》 被引量: 95发表: 2010年 The Comprehensive Boost of Teaching Quality...
摘要: 即将毕业的大四宅男上杉彰彦写下的一部名为《脑补症候群》的小说,被一家叫"伊普西隆"的科技公司看中.此公司声称要以该小说为蓝本,开发一款不同于传统游戏机的"现实模拟"系统(也就是今天的VR)——"KLEIN-2(克莱因壶)". 查看全部>>关键词:
“变老”意味着更好 人们常常在年过三十之后的每一个生日,感叹“一年更比一年老啦”。实际上,有的专家甚至发现“变老”也许意味着“更好”。 舒菲 - 《医药保健杂志》 被引量: 0发表: 2007年 逆龄大脑:保持大脑年轻敏锐的新科学 我们都会变老,大脑也一样,大脑的生长在24岁这个年轻得令人惊讶的年龄开始减速...
串性化,指的是强制事务串行执行,其可以避免“幻象读”的问题出现,这是最严格的隔离级别了。因为串行化需要在发生竞争的数据上加锁,所以并发性能不高,只有在对数据一致性要求非常高且并发度不高的情况下才会考虑使用这种隔离级别。
CS3402 ER ER Explain the difference between an entity and a relationship ● An entity is an object or concept about which you want to store information. ● Relationships illustrate how two entities share information in the database structure....