Categories
Multimedia Deign MySQL

ER-Diagram Symbols

Above you see the atomic building blocks of the ER-Diagram:

  • Entity
  • Attribute
  • Relation
  • Carninalities (Crow’s feet notation) one, zero-or-one, zero-or-many, one-or-many, many.

From Requrements to Deployment

Model inspired by Jukić et al.

ER-Diagram

This ER-Diagram is inspired by some of the tables in his sample database

 

Database Implementation

Here are Ben Forta’s tables in PhpMyAdmin “design viewW.

During implementation you will create the tables and structure.

Note that you have to design the data as integers, numbers, etc.:

  • cust_id = int(11)
  • cust_name = char(50)

The customers table in ER-diagram form.

Normalizing

 

In the diagram the cardinalities have to be normalized. Here are a few solutions to typical problems.

 

TIP: From ER-diagram to HTML form

Look at the attributes. Create an input for each field. Then use the INSERT keyword.

By Per Thykjaer Jensen

Per is the WordPress expert at Business Academy Aarhus. Senior Lecturer at the Multimedia Design Programme. His background is in the Arts: MA Literature History and BA Art History. Later he added a MA in IT, interaction and Multimedia. And he is a wicked Linux user.

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