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

admin2009-02-24 498

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

选项 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.