normal form 1

normal form 2

normal form 3

1 NF

Yes, each normal form builds upon the lower forms, such that a database in form N will also be in form N-1, N-2, etc. A database in fifth normal form, for example, will also be in first through fourth normal forms.

First normal form, second normal form, third normal form, fourth normal form, fifth normal form and Boyce Codd normal form. See the related question below.

First normal form, second normal form, third normal form, fourth normal form, fifth normal form and Boyce Codd normal form. See the related question below.