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Database Management System (DBMS)
A set of programs that permits an organisation to:
­ centralise data
­ create database files
­ manage them efficiently
­ access the data when required
Using a DBMS, users can
­ create new database files
­ add, delete, alter, and sort data
­ make enquiries…

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Basic Components

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A table for each separate entity
Design mode allows user to define a data
structure for the table
A primary key ­ which must be a unique
identifier for each record - must be defined.
(Access does provide an Autonumber
function is there is no natural unique

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A user-friendly method of entering data for the
main user(s) of a database
Usually has one data source, which may be a
table or a query
The objects that allow fields to displayed and/or
modified are known as controls
Design is very important
­ Order of controls
­ Layout…

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Used to create subsets of data held in tables
Used to combine the contents of more than one
­ This is achieved via the relational links that are created
between tables
The are several types of query
­ Simple select query
­ Update query
­ Append query

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Reports are usually used in conjunction
with queries to produce sorted output
satisfying particular criteria
MS Access provides powerful wizards to
produce reports with various sort, grouping
and style options.

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The relational database model depends upon the
creation of relational links between separate entities
One-to-Many relationship
­ For example in a surgery database, a doctor would have
many patients
Doctors Patients

One-to-one relationship
­ a doctor would have one expense account

Doctors Expenses


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