2. 计算机
  3. What operation on relations R and S produces the relation shown below? { tuple | tuple∈R ∨ tuple∈S} ( )

What operation on relations R and S produces the relation shown below? { tuple | tuple∈R ∨ tuple∈S} ( )

admin2009-07-15  25
问题 What operation on relations R and S produces the relation shown below? { tuple | tuple∈R ∨ tuple∈S} (    )
选项 A、union
B、difference
C、intersection
D、division
答案A
解析
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笔试

原NCRE全国计算机四级

NCRE全国计算机四级

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