normalizaciÓnprofwnegron.weebly.com/uploads/8/1/9/1/8191586/... · let’s look at this table:...

NORMALIZACIÓNPROF. WANDA I NEGRON RIOS

WANDAI.NEGRON@UPR.EDU

USER VIEWS

• A user view can help us see what data

is collected and saved by a system

• Examples of user views:

• Input / Output Screens

• A report

• A form

• A table

USER VIEWS

• It’s just one of many places to start to

determine which data your system

needs to collect, process, and store

LET’S LOOK AT THIS TABLE:

ORDER_

NUMBER

ORDER_

DELIVERY_

NUMBER

AMOUNT

DESCRIPTION

VENDOR_

NUMBER

VENDOR_

ADDRESS

11673 05/15/2013 05/29/2013 2396

Fan Belt

Oil Filter

Tail Lamp

$13.50

$18.95

Harding

United

242 River St., Beacon, NY 10437

11 Oak Ave., Chadwick, NJ 07769

232 Hill Rd., Norwalk, CT 14876

11674 05/16/2013 05/30/2013 1195 1 Oil Filter $5.75 561 Harding 11 Oak Ave., Chadwick, NJ 07769

Observe how for the first order, the first three fields would

have to be stored repeatedly for each part ordered.

This would mean repeating the same data three times.

This is inefficient use of data storage space.

CONVERT TO THIS FORMAT:

ORDER_

NUMBER

ORDER_

DELIVERY_

NUMBER

AMOUNT

DESCRIPTION

VENDOR_

NUMBER

VENDOR_

ADDRESS

11673 05/15/2013 05/29/2013 2396

Fan Belt

Oil Filter

Tail Lamp

$13.50

$18.95

Harding

United

ORDER (Order_Number, Order_Date, Delivery_Date,

Part_Number, Part_Amount, Part_Description,

Unit_Price, Vendor_Number, Vendor_Name,

Vendor_Address)

UNDERLINE THE PRIMARY KEY

ORDER_

NUMBER

ORDER_

DELIVERY_

NUMBER

AMOUNT

DESCRIPTION

VENDOR_

NUMBER

VENDOR_

ADDRESS

11673 05/15/2013 05/29/2013 2396

Fan Belt

Oil Filter

Tail Lamp

$13.50

$18.95

Harding

United

Part_Number, Part_Amount, Part_Description,

Vendor_Address)

INDICATE REPEATING GROUPS { }

ORDER_

NUMBER

ORDER_

DELIVERY_

NUMBER

AMOUNT

DESCRIPTION

VENDOR_

NUMBER

VENDOR_

ADDRESS

11673 05/15/2013 05/29/2013 2396

Fan Belt

Oil Filter

Tail Lamp

$13.50

$18.95

Harding

United

{Part_Number, Part_Amount, Part_Description,

Vendor_Address})

INDICATE REPEATING GROUPS { }

(Order_number, Order_date, Delivery_date, {Part_number,

Part_amount, Part_description, Unit_price,Vendor_number,

Vendor_name, Vendor_address})

FIRST NORMAL FORM (1NF)

1. Remove the repeating group and make it a table

You will end up with two tables

ORDER (Order_number, Order_date, Delivery_date)

(Part_number, Part_amount, Part_description, Unit_price,

Vendor_number, Vendor_name, Vendor_address)

FIRST NORMAL FORM (1NF)HOW DO WE “TIE” THE TWO TABLES?

(Part_number, Part_amount, Part_description, Unit_price,

Answer: adding the Primary Key of the first table

FIRST NORMAL FORM (1NF)NOW YOUR TWO TABLES ARE CONNECTED

(Order_number, Part_number, Part_amount,

Part_description, Unit_price, Vendor_number, Vendor_name,

Vendor_address)

** The second table has a compound or concatenated key.

FIRST NORMAL FORM (1NF)NAME THE SECOND TABLE

ORDER-PART

Vendor_address)

FIRST NORMAL FORM (1NF)COMPOUND PRIMARY KEY

ORDER-PART

Vendor_address)

The new table (for the repeating group) will have:

• The Primary Key of the original table +

the fields from the repeating group

• The Primary Key will be a compound key* consisting of:

• The primary key of the original table +

the primary key of the repeating group

* Aka – Concatenated Key

• WAIT…

• What if the table has no repeating groups?

(see example below)

• Then you will say:

• “The table is already in 1NF because there are no

repeating groups”

EMPLOYEE

(Employee_Number, Employee_Name, Employee_Address,

Employee_Education)

SECOND NORMAL FORM (2NF)

• Remove Partial Dependencies

• This is applied to the table with the compound primary key

• All fields must be dependent on the primary key

(on the entire concatenated key)

• If you find fields that are only dependent on one part of

the compound key, take them out and make another table.

• Analyze each field

ORDER-PART

(Order_number, Part_number, Part_amount, Part_description, Unit_price,

• This is applied to the table with the compound primary key

ORDER-PART

(Order_number, Part_number, Part_amount, Part_description,

Unit_price, Vendor_number, Vendor_name, Vendor_address)

(Order_number, Order_date, Delivery_date)

“Order” is already in 2NF because it contains no

partial dependencies

ORDER-PART

Part_description, Unit_price, Vendor_number,

Vendor_name, Vendor_address)

ORDER-PART

Part_description, Unit_price, Vendor_number,

• Split this table into two tables:

• One table with the fields that depend on the

entire concatenated key

• Another with the fields that depend on only one

ORDER-PART

(Order_number, Part_number, Part_amount)

(Part_number, Part_description, Unit_price,

Notice that the tables are connected through the

field Part_number.

SECOND NORMAL FORM (2NF)ALL TABLES

ORDER-PART

THIRD NORMAL FORM (3NF)

• Remove Transitive Dependencies

• Where there is a non-key field that is dependent

on another (both non-keys)

• Check all tables for transitive dependencies

ORDER-PART

(Part_number, Part_description, Unit_price, Vendor_number,

• Non-key field dependent on another non-key field

“Order” is already in 3NF because it contains no

transitive dependencies

ORDER-PART

“Order-Part” is already in 3NF because it contains

no transitive dependencies

Vendor_number)

VENDOR

(Vendor_number, Vendor_name, Vendor_address)

• Create a new table with the fields from the 2NF

table that depend on another nonkey field

• The primary key of this table will be the field

that the other(s) depend on

• Leave the primary key of the new table in the

original table

• It will be called a foreign key – identified by a

dashed underline

THIRD NORMAL FORM (3NF)LIST ALL YOUR TABLES

FINAL SOLUTIONORDER

ORDER-PART

(Part_number, Part_description, Unit_price, Vendor_number)

VENDOR

(Vendor_number, Vendor_name, Vendor_address)

NOW WE PREPARE THE ERDS

• An Order contains one or many parts.

• A Part has only one description and unit price.

• A Part has only Vendor.

NOW WE PREPARE THE ERDS

VENDOR

ORDER-PART

Belongs to

normalizaciÓnprofwnegron.weebly.com/uploads/8/1/9/1/8191586/... · let’s look at this table:...

Documents

kmbt...

part_ i_220_kv_ lunawada_ epc

the person of...

laboratorio #1 - powerpoint 2013profwnegron.weebly.com ›...

order_.pdf · the terms and conditions of the appointment...

h = h • ds...

pursue christian virtues -...

regd.no.prakasam/13/2015-2017...

powerpoint 2013 ejercicio #2 -...

section b faculty of physiotherapy 143.0 specific ......

in color order_ striped drawstring bag tutorial

part c survey questionnaire - uk p&i documents/part_… ·...

p~eesiiest.weebly.com/uploads/2/6/9/2/26921317/part_-_4...12.2...

physical constants - ees iiest,...

before the maharashtra electricity regulatory commission...

km c364e-20170322091009 18 order_ judge...sizakele moloko...

microsoft excel 2010 -...

irregular verbs l 2 past past part_ a2

microstructure*proper-es.pajarito.materials.cmu.edu/rollett/27301/l9-tensor-aniso-props-part_… ·...

regd.no.prakasam/13/2015-2017...