Exam 98-364 topic 1 question 71 discussion

repeating group (database) Any attribute that can have multiple values associated with a single instance of some entity. For example, a book might have multiple authors.Such a "-to-many" relationship might be represented in an normalized relational database as multiple author columns in the book table or a single author(s) column containing a string which was a list of authors. Converting this to "first normal form" is the first step in database normalization. Each author of the book would appear in a separate row along with the book's primary key. Later normalization stages would move the book-author relationship into a separate table to avoid repeating other book attributes (e.g. title, publisher) for each author.

There are two correct answers here. Each row must be unique, so rows cannot be duplicated, and repeating groups are not permitted.