Question

adding a reviewdate to the ratings table in this erd serves multiple purposes. what is not a reason for adding it? a.) to identify when a rating was submitted b.) to identify a user's most recent rating c.) to determine which rating was submitted by which user d.) to track user activity based on the rating dates

Answer 1

Adding a review date to a ratings table is not used to c. determine which rating was submitted by which user; this is usually done with a user identifier. The review date is instead used to identify when a rating was submitted, a user's most recent rating, and to track user activity based on rating dates.

Step-by-step explanation:

The question asks about the purpose of adding a review date to a ratings table in an entity-relationship diagram (ERD). The review date serves several functions, but it is not used to determine which rating was submitted by which user. That information is typically handled by a user ID or some other form of user identifier linked to the rating in the database design.

Option a, identifying when a rating was submitted, is a common reason for including a review date as it provides temporal context to the rating. Option b, identifying a user's most recent rating, can be easily done using the review date field to sort the ratings. However, option d, tracking user activity based on rating dates, is also a valid use of the review date as it provides insights into user engagement over time.