单项选择题

Which values are NOT permitted to be part of the primary key

A．NULL
B．punctuation
C．special characters
D．alpha-numeric characters
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单项选择题
Which operating system can Oracle database NOT be used in
A．DOS
B．UNIX
C．Windows95
D．IBM Mainframes
单项选择题
What Normal From is the table shown in the exhibit emps tblemp idemp_nameemp_phonedept_namedept_phonedept_mgrname(1) emp_id→emp_name, emp_phone, dept_name(2) dept_name→ dept_phone, dept_mgrname
A．1NF
B．2NF
C．3NF
D．BCNF
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