Question 16 :
Relations are categorized into normal forms according to the referential integrity constraints that they have.
Question 17 :
A relation is in Boyce-Codd Normal Form (BCNF) if every determinant is a composite key.
Question 18 :
A functional dependency is always an equation.
Question 19 :
A relation has cells that hold multi-value entries.
Question 20 :
In a relation, the rows are sometimes called "fields."