The word key indicates a field or fields whose value uniquely or ...

[penguins]

The word key indicates a field or fields whose value uniquely or nonuniquely identifies a record or set of records.
 
  Indicate whether the statement is true or false

Question 2

A null value in a column may indicate that there is an appropriate value for that attribute, and although the value is known, no one has entered the value into the database.
 
  Indicate whether the statement is true or false

[honnalora]

Answer to Question 1

TRUE

Answer to Question 2

TRUE