database A series of steps followed to obtain a
database design that allows for efficient access and
storage of data
redundancy and the chances of data becoming inconsistent.
work defined three such forms but there are now five generally
accepted steps of normalisation. The output of the first step
is called First Normal Form (1NF), the output of the second
step is Second Normal Form (2NF), etc.
each into a separate table and connecting them with a
partial key by putting the fields in a separate table from
those that are dependent on the whole
key.
Third Normal Form eliminates functional dependencies on
non-key fields by putting them in a separate table. At this
stage, all non-key fields are dependent on the key, the whole
key and nothing but the key.
Fourth Normal Form separates independent multi-valued facts
stored in one table into separate tables.
Fifth Normal Form breaks out data redundancy that is not
covered by any of the previous normal forms.
[What about non-relational databases?]
(1999-05-05)