简述数据模型的分类。
(1)概念层数据模型。(2)逻辑层数据模型。(3)物理层数据模型。
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/235548.html
上一篇: Passage Two There are many different kinds of evidence that women and men are judged differently even if they talk the same way. This tendency makes mischief in discussions of women, men and power If a linguistic strategy is used by woman, i
下一篇:已知矩阵A相似于对角矩阵Λ=,求行列式|A-E|的值。
已知矩阵A相似于对角矩阵Λ=,求行列式|A-E|的值。