Database management system Introduction

Here is Introduction to the database management system. The word data has come from the Latin word Datumn. 

 

Data

Data is the plural number of Datumn. Datumn is meaning elements of information. Example: Text, audio, picture, video, etc. 

Database management system Introduction

There is no way to understand which data is meaning what.
Very confusing….
It is unprocessed, meaningless. This is called data. 

Know about the types of data and equipment. 

Data definition

Data are some facts that are meaningless and unprocessed. 

Now, from the picture, if we collect all the data and present then in a table form then we get-

Personal-Info

Roll	Name	Gender	GPA	Age
19	Rahman	Male	3.63	23
20	Ahmed	male	3.17	22

Here this data will be called information because it has meaning. It is processed.

So, we can explain it like this,

Information

Processed and structured data is called information.

Unprocessed/ meaningless facts	Data	Processed and meaningful data
Data	After processing	Information

Difference between data and information

Data	Information
Some facts are meaningless/not processed.	Processed data is called information.
It gives little knowledge about something.	It gives complete knowledge of something.
We cannot use it directly.	It is directly usable.
Example: Figure-1.	Example: Given Personal-Info table.

Database 

A database is a collection of data in a structured way. The database is built with data and a base. The use of a database has become essential now. Student’s information’s in government education, banking, hospital management, companies use a database for saving all the information.
We can define a database like this,
The collection of interrelated data tables or files is called a database.

Advantages 

1. We can represent data quickly
2. Easily can find any inserted data.
3. Data can be updated easily.
4. Data can be secure easily.
5. It can be accessed by a lot of people at a time.

Disadvantages

1. If the Security system is weak then it will do a lot of financial damage to an institution or company. So, security is essential.
2. A specialist is essential for this.

Applications

1. Creating a database
2. Updating database
3. Print database
4. Backup and recovery database
5. Save data
6. Retrieve data
7. Delete data
8. Securing data

Applied sources

1. Airway system and railway system
2. Banking 
3. Educational institution
4. Human resource
5. E-commerce

Data abstraction

Basically, there are 3 levels of data abstraction

One part is for the user view. Here are the data which are view by the user. Another one is the logic applied level. It is meaning the data type, fields, and attributes, etc. And the final one is the physical level.

We have to learn a database for becoming a web developer, android development/mobile application development, for controlling a database system for a company, etc. We have to learn how to create a database, how to store data, how to delete data, how to update data, and how to delete the whole database, and also many operations.