Question 11 :
In a relation, the order of the columns does not matter.
Question 12 :
A functional dependency is a relationship between or among attributes.
Question 13 :
A key is a group of one or more attributes that uniquely identifies a row.
Question 14 :
Keys made up of two or more attributes are called composite keys.
Question 15 :
Given the functional dependency R ? S , R is called the determinant.