专门的关系运算中,水平方向上进行的运算是
A.交
B.选择
C.投影
D.连接
正确答案是B
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/525706.html
上一篇:从法律规范确定的行为规范性质角度讲,法律规范的分类不包括( )
从法律规范确定的行为规范性质角度讲,法律规范的分类不包括( )
下一篇:(1) The car pulled up and its driver glared at us with such sullen intensity, such hatred, that I was truly afraid for our lives.He looked like the sort of young man who might kill a president.(2)He was glaring because we had passed him