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Qu'est-ce (qui) est normalisation$541585$ - définition
CONSTANT A SUCH THAT AF(X) IS A PROBABILITY MEASURE
Normalisation factor; Normalising constant; Normalization factor; Normalization constant; Constant of normalization; Constant of normalisation; Normalisation Constant; Normalisation constant; Normalizing factor
AFNOR
STANDARDS ORGANIZATION OF FRANCE
Association française de Normalisation; Association française de normalisation; Laboratoire Central de l’Electricité; Afnor; Association Française de Normalisation
AFNOR
STANDARDS ORGANIZATION OF FRANCE
Association française de Normalisation; Association française de normalisation; Laboratoire Central de l’Electricité; Afnor; Association Française de Normalisation
Association Française de Normalisation (AFNOR, English: French Standardization Association) is the French national organization for standardization and its International Organization for Standardization member body.
database normalisation
REDUCTION OF DATA REDUNDANCY
Database normalisation; Normal forms; Canonical synthesis; Database Normalization; Database normal form; Normalization (database); Relational Database Normalization; Database Normalisation; Data anomaly; Insertion anomaly; Insert anomaly; Update anomaly; Delete anomaly; Deletion anomaly; Normalised data; Data normalisation; Normal form (databases); Relational schema normalization; Normalized data
<database> A series of steps followed to obtain a database
design that allows for efficient access and storage of data
in a relational database. These steps reduce data
redundancy and the chances of data becoming inconsistent.
A table in a relational database is said to be in normal
form if it satisfies certain constraints. Codd's original
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.
First Normal Form eliminates repeating groups by putting
each value of a multi-valued attribute into a new row.
Second Normal Form eliminates functional dependencies on 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.
http://bkent.net/Doc/simple5.htm.
[What about non-relational databases? ]
(2005-07-28)
Wikipédia
Normalizing constant
The concept of a normalizing constant arises in probability theory and a variety of other areas of mathematics. The normalizing constant is used to reduce any probability function to a probability density function with total probability of one.
