What is a Domain of Values in the context of databases?

A Domain of Values in the context of databases refers to the set of allowable values for a given attribute. This concept defines the constraints and permissible entries for that attribute, ensuring data integrity and consistency within the database.

For instance, if an attribute is designated to hold a date of birth, its domain of values would be restricted to valid date formats and values that fall within a realistic range (e.g., not allowing future dates). Similarly, if a field is intended to store a status code, the domain might define which specific codes are valid (e.g., "Active," "Inactive," "Pending").

This approach helps enforce rules at the database level, minimizing errors and maintaining the quality of data that can be entered into the database.