Degree And Cardinality In SQL
Answer.
In SQL, degree and cardinality are terms used to describe aspects of the relationships between tables in a database.
- Degree:
- Degree refers to the number of attributes or columns in a table.
- It represents how many columns are present in a table.
- For example, if you have a table called “Employees” with columns like “EmployeeID,” “FirstName,” “LastName,” and “Salary,” then the degree of the “Employees” table is 4 because it has four columns or attributes.
2. Cardinality:
- Cardinality refers to the number of rows or records in a table.
- It represents how many records are present in a table.
- For example, if the “Employees” table contains 1000 records, then the cardinality of the “Employees” table is 1000 because it has 1000 rows.
In SQL, understanding the degree and cardinality of tables is crucial for designing and querying databases effectively. These concepts help in defining the structure and size of the tables, which, in turn, affects the efficiency and performance of database operations.
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