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D. A set of permissible attribute values
A relational database domain refers to a set of permissible values that an attribute (column) in a database table can take. In other words, it defines the range of acceptable values for a particular attribute in a table.
For example, if you have a table representing employees, and one of the attributes is "Gender," the database domain for the "Gender" attribute would typically be a set of permissible values like "Male" and "Female."
Similarly, if you have a table representing products, and one of the attributes is "Category," the database domain for the "Category" attribute would be a set of valid categories like "Electronics," "Clothing," "Books," etc.
Defining the database domain for each attribute helps ensure data integrity and accuracy in a relational database. It ensures that only valid and permissible values can be inserted into the database, preventing the entry of incorrect or irrelevant data. The domain is typically specified using data types and constraints during the creation of database tables.
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