关系型数据库管理系统

CHECK YOUR PROGRESS-Session1 1. The network data model allows a child node to have more than one parent2. A relational database is a database structured on the relational model3. Data Control Language (DCL) is used to administer permissions on the databases and database objects4. In the relational model terminology, a row is called a tuple, a column an attribute and the table is called a relation5. A Database Management System can be defined as a collection of related records and a set of programs that access and manipulate these records6. A Data model describes a container for storing data and the process of storing and retrieving data from that container CHECK YOUR PROGRESS - Session2 1. During logical data modeling, the data modeler develops a detailed description of the data and the various entities involved with it2. One or more attributes that can uniquely define an entity set is called primary key3. An attribute that contains

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