单项选择题

Which operating system can Oracle database NOT be used in

A．DOS
B．UNIX
C．Windows95
D．IBM Mainframes
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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
单项选择题
What is the candidate key of a relational database
A．A field with a constraint placed on it.
B．A set of fields that have no data in them.
C．A set of fields in a table used to identify a record uniquely.
D．Fields from multiple tables that are used for sorting records.
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