Changes

===Third normal form===

Third normal form (3NF) is a normal form that is used in normalizing a database design to reduce the duplication of data and ensure referential integrity by ensuring that:-

# the entity is in second normal form

Update anomalies cannot occur in these tables, because unlike before, '''Winner''' is now a primary key in the second table, thus allowing only one value for '''Date of Birth''' for each '''Winner'''.

==Database Normalization==