2. 计算机
  3. For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the prima

For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the prima

admin2009-02-24  53
问题 For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the primary key.This relation R is at least in
选项 A、1NF
B、2NF
C、3NF
D、BCNF
答案B
解析
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原NCRE全国计算机四级

NCRE全国计算机四级

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