ERD:
First
A table is said exist on normal form I if it don't exist on unnormalized form table, where is happening multiplexing a sort field and enabling available field that null (empty).
Second
Second Normal Form 2NF is satisfied in a table if it has satisfies the 1NF, and all attribute except primary key, integratedly have functional dependency in primary key. A table doesn't meet 2NF, if there're attributes which its dependency (Functional Dependency) only being partial (only dependant in half of the primary key). If there're attributes which doesn't have dependency with primary key, so that attribute must be removed.
Third
Normal form 3NF fufilled if have fulfilled form 2NF, and otherwise there is attribute of is non key primary owning depended to attribute of is non the other key primary.
