视图--虚拟表
在机房收费系统中，很多人很快就完成了，经过我的通过访问调查的方式得知：很多人是根据自己的需要建立的数据表。或许这样虽然在数据库设计中省去很多时间，以便加快进度但是可能会造成数据库的冗余，让自己的数据库运行慢。不过，目前阶段我们的数据库比较小
在机房收费系统中，很多人很快就完成了，经过我的通过访问调查的方式得知：很多人是根据自己的需要建立的数据表。或许这样虽然在数据库设计中省去很多时间，以便加快进度但是可能会造成数据库的冗余，让自己的数据库运行慢。不过，目前阶段我们的数据库比较小，性能优化带来的好处可能会不太明显。在看陈伟视频的时候我了解到视图的作用，并运用到了自己的数据库设计当中。视图，想当于一个虚拟的数据表，可以根据自己的需要建立并调用相应的视图。建立视图有两种方式：1.利用编写代码的方法。如图一，图二。2.利用sql server中自带的功能，右击并新建视图。然后就是试图的调用，如图三（蓝色字体的）
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