请教各位达人: In a database system, the duplication of data items is referred to as _____________ which two words correctly completes this sentence? A. Data independence B. Data integrity C. Data integration D. Data redundancy 我的理解是从以上的选项中选择2个,但是答案的选择只有D 希望达人们可以替我解释一下,非常感谢! |