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Thursday, October 6, 2016

DBMS Tutorial - Database Tutorial

Database

Name itself indicates what it is. Database is a place/container where all the data is stored. But what is data?  In a database, even a smallest piece of information becomes data. For example, Student is a data, course is a data, and Color is a data, height, weight, food everything is data. In short, all the living and non-living objects in this world is a data.

Why we need data?

We need data so that we can perform various actions on them. Say, we do not have any database and we want to record what is the height and weight of a baby in a year. What we do is note it in a piece of paper every month. At the end of the certain period or year, we would check up if he/she is growing correctly. If some entry is wrong or irrelevant, we correct it or strike it off. Same is done using database. We would be storing all these information in the database. If we want to check the growth, we would be pulling the information from the database, if we need to change any information, we can update/delete them. But all the data will be at one place - Database.

What type of data is stored in database?

In a database, we would be grouping only related data together and storing them under one group name called table. This helps in identifying which data is stored where and under what name. It reduces the time to search for a particular data in a whole database. For example, Student, Teacher, Class, Subject, Employee, Department etc form individual tables.
DBMS Tutorial      DBMS Tutorial

And for whom these datas are stored?

We store only related data - related to one particular requirement / application. For example, Student database - it will have all the information of students ranging from his ID, Name, Date of birth, class, to grade, prizes who are studying in a particular College.

How do we determine which data is relevant to be put in a particular database?

It all depends on what database we are developing, and what is the exact requirement/purpose of it. Say, we need to create College database. What could college database contain? First thing is that we need to store college information like its name, address. Next comes courses offered in that college, Staffs and their details, students and their details.  But do we store all these information under one table - College? Will database be quick in getting the data or updating? Certainly Not!  It would become a chaos if everything is stored in a single table. Hence they introduce certain rules to manage the database - relational database management system (RDBMS). RDBMS is a program that guides us how to create and maintain a database. It tells us how to divide related information into different tables and inter-relate them so that we can select/insert/update/delete all the related data easily and efficiently.

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