问题
单项选择题
What operation on relations R and S produces the relation shown below ( ){tuple | tuple∈R∧tuple∈S}
A．union
B．difference
C．intersection
D．division
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
What operation on relations R and S produces the relation shown below ( ){tuple | tuple∈R∧tuple∈S}
A．union
B．difference
C．intersection
D．division
参考答案：C