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Introduction to Database
Transcript of Introduction to Database
maintained in the pre-computer period?
the Database approach
Manual filling system
Database is a collection of Related Datas
What do these records contain?
Let's take a look...
An Employee Records holds:
But what do we do with the Records?
What do we do with Records?
This is Manual Filling and it is Time consuming, Costly and Prone to Errors
what is a Database
Which means, instead of having 3 Cabinets of Data
We Will Have a Single Database File
It is a shared collection of logically coherent data with some inherent meaning;
It is designed , built and populated with data for specific purpose such as meeting the information needs of an organization;
Can a user access a database through an application program alone
Can a user directly access database?
We would need a DBMS
What is DBMS
A Software System that enables user to:
Define Create and Maintain the Database
DDL(Data Definition Language)
DML(Data Manipulation Language)
Provide controlled access to this Database
User-accessible catalogue (description of data)
This is the Database
Handles Queries and Access Datas
Before the Users could access the database
their request would be recieved by the DBMS Software
This is the Simplest Example of a woking
Other Examples of Database System?
Credit Card company
Casiño, Jan Michael F.
Then How can a User access a Database?