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Dbms Tutorials

Relational Model Concepts

by anupmaurya December 9, 2022
written by anupmaurya 0 comment

Different types of Relational Model Concepts are as follows :

  1. Attribute: Each column in a Table. Attributes are the properties which define a relation. e.g., Student_Rollno, NAME,etc.
  2. Tables – In the Relational model the, relations are saved in the table format. It is stored along with its entities. A table has two properties rows and columns. Rows represent records and columns represent attributes.
  3. Tuple – It is nothing but a single row of a table, which contains a single record.
  4. Relation Schema: A relation schema represents the name of the relation with its attributes.
  5. Degree: The total number of attributes which in the relation is called the degree of the relation.
  6. Cardinality: Total number of rows present in the Table.
  7. Column: The column represents the set of values for a specific attribute.
  8. Relation instance – Relation instance is a finite set of tuples in the RDBMS system. Relation instances never have duplicate tuples.
  9. Relation key – Every row has one, two or multiple attributes, which is called relation key.
  10. Attribute domain – Every attribute has some pre-defined value and scope which is known as attribute domain
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