Final answer:
Relational data model concepts include relations, which are like tables, attributes, or columns in a table; domain, representing the set of possible values for an attribute; tuples, individual entries in a table; intension and extension, reflecting the database schema and the data itself; and degree and cardinality, indicating the number of attributes and records in a table respectively.
Step-by-step explanation:
Defining the Concepts of the Relational Data Model
The relational data model is a framework used to define database structures and it uses several key concepts which are briefly explained as follows:
- A relation in the context of a database, also known as a table, is a set of tuples that have the same attributes. An example of a relation could be a table named "Students" where each tuple represents a student record.
- An attribute is a property or column in a relation. For instance, in the "Students" table, attributes might include "StudentID", "Name", and "Age".
- The domain of an attribute is the set of all possible values it can contain. For example, the domain of the attribute "Age" might be all positive integers.
- A tuple, or record, represents a single entry within a relation. In the "Students" table, one tuple could contain the data for one specific student.
- The intension of a database refers to the schema or design of the database, such as the structure of the relations and the attributes they contain. The extension is the actual data or records within those structures at any given moment.
- The degree of a relation is the number of attributes it contains. If the "Students" table has three attributes, its degree is three. The cardinality refers to the number of tuples in the relation. If there are 200 student records, the cardinality of the "Students" table is 200.