单项选择题

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

A．It does not matter what order the rows are i
B．It does not matter what order the columns are i
C．Different columns should have different column name
D．Different columns should have different data type
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单项选择题
In a tree directory of a file system, relative path name can be used to find files for improving directory retrieval. To do this, which directory of the followings should be set up
A．parent directory
B．child directory
C．working directory
D．home directory
单项选择题
Which of the following is not responsibility of DBA(Data Base Administrator)
A．Database management system design
B．Database schema definition
C．Database schema modification
D．Integrity constraint specification
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