选择题：Which of the following is not among the basic features of a relational database?

题目内容：

Which of the following is not among the basic features of a relational database?

A．It does not matter what order the rows are in.

B．It does not matter what order the columns are in.

C．Different columns should have different column names.

D．Different columns should have different data types.

参考答案：【答案仅供学习，请勿对照自行用药等】

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