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(i) Define the term Domain with respect to RDBMS. Give one example to support your answer.
Answer
Answer by student
Domain is a set of values that a column can have in a table. For example, a domain of email addresses for a column that stores user emails.
Detailed answer by teachoo
- Domain is a term used in relational database management systems (RDBMS) to describe the data type and constraints of a column in a table.
- A domain defines the range of possible values that a column can store in a database . For example, a column that stores user emails can have a domain of email addresses.
- A domain helps to maintain data integrity and consistency by preventing invalid or inappropriate values from being stored in a column.
- A domain can be created using the CREATE DOMAIN command in SQL. The syntax is:
CREATE DOMAIN domain_name AS data_type
[ CONSTRAINT constraint_name CHECK (condition) ];
- A domain can also be modified or deleted using the ALTER DOMAIN or DROP DOMAIN commands in SQL.
So, the correct answer is : Domain is a set of values that a column can have in a table. For example, a domain of email addresses for a column that stores user emails.
