Always keep in mind the building blocks of databases and their hierarchical relationships: databases consist of tables, which consist of fields.
牢记数据库的构建块及其继承关系：数据库由表组成，表由字段组成。
Always keep in mind the building blocks of databases and their hierarchical relationships: databases consist of tables, which consist of fields.
牢记数据库的构建块及其继承关系：数据库由表组成，表由字段组成。
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