Which statements are true regarding database and maintenance views?

A database view is a logical representation of data derived from one or more tables, and it can include complex queries and support filtering, sorting, and joining data from different tables. Typically, database views are designed to be implemented using inner joins because they return only the rows that have matching values in both tables involved in the join. This characteristic is essential for ensuring that the view provides a more refined dataset where all included records meet specific criteria, thus maintaining data integrity and relevance.

In contrast, maintenance views serve a different purpose. They are primarily designed for data maintenance tasks and can be implemented utilizing inner or outer joins based on the specific requirements of the data involved. However, the statement for a maintenance view implemented as an outer join or an inner join is not universally true, as the implementation type depends on the involved tables' relationships.

Given this context, the choice stating that a database view is implemented as an inner join accurately reflects the typical implementation logic of database views, focusing on retrieving a refined subset of data while maintaining relevant relationships.