![](https://csdnimg.cn/release/download_crawler_static/87149589/bgd.jpg)
数据存储的完整性
Roll Number
Name Address BookTaken
12
Alicia Ruth 12, Temple Street AC091
14
Jason Darren 123, Sunset Blvd. AC043
15
Mary Beth
32, Golden Avenue AC021
12
Alicia Ruth 12, Temple Street AC043
12
Alicia Ruth 12, Tmple Street AC011
15
Mary Beth 33, Golden Avenue AC011
存在不正确、不准确的数据,数据库“失去了完整性
”
姓名
不同的地址!