Which of the following identifies a row within a relational database and is used for indexing?
A.
Foreign key
B.
Primary key
C.
Cell
D.
Tuple
Explanation:
The primary key is an identifier of a row and is used for indexing inrelational databases. Each row must have a unique primary key to properly represent the row as one entity. When a user makes a request to view a record, the database tracks this record by its unique primary key.