2. 计算机
  3. Let R and S be the relation respectively: 　　 The number of tuples that the result of the expression R co S (Here is the natura

Let R and S be the relation respectively: 　　 The number of tuples that the result of the expression R co S (Here is the natura

admin2009-02-24  37
问题 Let R and S be the relation respectively:  　　

The number of tuples that the result of the expression R co S (Here is the natural join of relations R and S) is
选项 A、3
B、4
C、6
D、9
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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