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  27
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
转载请注明原文地址:https://kaotiyun.com/show/KJNZ777K
0

笔试

原NCRE全国计算机四级

NCRE全国计算机四级

相关试题推荐
随机试题
最新回复(0)