2. DATA MODELLING It is the first step in creating a database.
You must first understand the Organisation that requires DBMS
Objective of the database The type or nature of data to be captured
and managed The Entities of the database The entity relations of
the database 3. DATA MODELLING It involves the process used to
define and analyse data requirements needed to support the business
processes. The levels or data modelling are; Conceptual data
modelling: analysing the organisation to with stakeholders
identifying entities in the organisation for database specifying
the scope of the DBMS Logical data modelling Translate conceptual
into data definitions Establishing entities and their attributes
Defining entity relations Physical data modelling Building and
organising logical models into database objects like tables, forms,
etc., and defining usage of the DBMS 4. APPLYING DATA MODELLING You
may achieve this by deploying the divide and conquer principle. Let
us as take a case study of saloon that needs a database management
system to run its operations Consider any government
institution/agency or private organisation that you think will need
a DBMS to improve their service or operations 5. APPLYING DATA
MODELLING Case Study: Saloon Operations 1. Consider the specific
things the DBMS is supposed to do (Objectives) To keep records of
customers To make reservation for customers To keep records of
Products and Services To Keep records of Staff of the Saloon And so
on 6. APPLYING DATA MODELLING Case Study: Saloon Operations 2. The
type or nature of information to keep The database text data,
numbers, dates and images for Example: images of products and
possibly services 7. Entities An entity may be a physical object
such as a house or a car or a person, an event such as a house sale
or a car service, or a concept such as a customer transaction
order. An entity may be defined as a thing which is recognized as
being capable of an independent existence and which can be uniquely
identified.Entity and Attribute And entities attribute is a set of
facts about that entity that uniquely identifies it from in a
database. For example the customer table for the saloon DBMS will
be: CustomerID, Surname, OtherNames, Gender, Address,
TelephoneNumber, 8. Entity RelationsONE ONE ONE MANY MANY MANY
