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What is a Domain in DBMS?

Quick Summary & Key Takeaways

• Subject Focus: DBMS Notes in English (BCA / B.Tech Syllabus)
• Core Topic: What is a Domain in DBMS? - General Topics
• Overview: What is a Domain in DBMS? In a Database Management System (DBMS), a Domain is the set of all permissible values for a particular attribute (column). It...
• Key Concepts: Domain in DBMS in Hindi, DBMS में Domain क्या है, Domain की परिभाषा, DBMS domain examples, Attribute domain, DBMS concepts, Domain का उपयोग,

What is a Domain in DBMS?

In a Database Management System (DBMS), a Domain is the set of all permissible values for a particular attribute (column). It acts as a constraint, ensuring that the data entered into a column is valid and consistent.

A domain defines the data type for a column and can also specify a range or a specific set of allowed values.

Example:

If you have an `Age` column in a `STUDENTS` table, you might want to restrict the age to be between 18 and 25. The domain for the `Age` column would be integers from 18 to 25. This can be enforced using a `CHECK` constraint:

Age INTEGER CHECK (Age BETWEEN 18 AND 25)

By defining a domain, you maintain data integrity and ensure that only appropriate data is stored in the database.

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