采用三级结构/两级映像的数据库体系结构，如果对数据库的一张表创建聚簇索引，改变的是数据库的（ ）。
- A.用户模式
- B.外模式
- C.模式
- D.内模式
正确答案及解析
正确答案
解析
对表的操作是模式级进行的操作，创建索引是内模式。AB是同一个概念。
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