repeating group

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 unnormalised 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 normalisation. Each author of the book would appear in a separate row along with the book's primary key. Later nomalisation stages would move the book-author relationship into a separate table to avoid repeating other book attibutes (e.g. title, publisher) for each author.
References in periodicals archive ?
"Third normal form" (3NF) data storage is the technical term for data storage that meets three requirements: (1) there are no repeating groups, (2) there aren't any non-key fields that depend on only part of the primary key, and (3) there aren't any dependencies on non-key fields.
Filling a border with repeating groups of these plants maximizes their impact while providing continuity.