3.3. 外部索引鍵 3.3. 外部索引鍵 回想一下在第 2 章 中的表格 weather 及 cities，思考下列問題：你想要保證沒有另一個人可以新增在 cities 中沒有的城市資料到 weather 中。這就是所謂資料關連性的管理。在簡單的資料庫系統當中，可能會這樣實作：先檢查 cities 中是否已有對應的資料，然後再決定資料表 weath...

Opening multiple databases in a single file Configuring databases sharing a file Caching databases sharing a file Locking in databases based on sharing a file Opening multip...

通过Sub-Pixel实现图像超分辨率 一、简要介绍 二、环境设置 三、数据集 3.1 数据集下载 3.2 数据集概览 3.3 数据集类定义 3.4 PetDataSet数据集抽样展示 四、模型组网 4.1 模型封装 4.2 模型可视化 五、模型训练 5.1 启动模型训练 六、模型预测 6.1 预测 6.2 定义预测结果可视化函数 ...

Overview What is Alluxio Benefits Technical Innovations Getting Started Downloads and More Overview What is Alluxio Benefits Technical Innovations Getting Start...

Introduction What is Alluxio Benefits Technical Innovations Getting Started Downloads and Useful Resources Introduction What is Alluxio Alluxio is world’s first o...

External File support The external file threshold Creating external files External file access External file storage External Files and Replication External File support E...

Ex_rep_base: putting it all together Ex_rep_base: putting it all together Beyond simply initializing a replicated environment, a Base API application must set up its communicat...

參考書目 SQL Reference Books PostgreSQL-specific Documentation Proceedings and Articles 參考書目 有關SQL及PostgreSQL值得閱讀的書籍及參考資料。 部份原始文件及技術報告亦可參閱University of California, Berkeley, Co...

Read your writes consistency Getting a token Token handling Using a token to check or wait for a transaction Read your writes consistency Some applications require the abili...

基本数据访问 基本数据访问 一旦你创建了模型，Django自动为这些模型提供了高级的Python API。 运行 python manage.py shell 并输入下面的内容试试看： >>> from books . models import Publisher >>> p1 = Publisher ( name = ...