Which primary key characteristic means it includes information that is easy to type and store?

The characteristic that refers to a primary key being easy to type and store is best represented by the concept of being simple. A simple primary key consists of a single attribute that is easy to manage and implement within a database. This simplicity ensures that the key can be efficiently used for indexing and data retrieval processes without adding complexity.

When a primary key is simple, it typically means it is composed of a straightforward data type, such as integers or strings, which helps with quick typing and minimizes the storage overhead. This is especially important in database design, as ease of use promotes better performance and usability in applications that interface with the database.

In contrast, other characteristics like non-null imply that the primary key cannot contain null values, which is crucial for ensuring that every record can be uniquely identified. However, it doesn't specifically focus on ease of typing or storage. Similarly, meaningless primary keys, while valuable for ensuring uniqueness without being tied to the actual data, do not address ease of use directly. Stable primary keys may change less frequently, minimizing the need for updates, but again, this does not pertain to the ease of typing and storage. Therefore, the attribute that directly relates to being easy to type and store is simplicity.