DBMS Tutorial contains various topics that will help you to master the database concepts and you can learn DBMS for your curriculum.
The name itself indicates what it is. A database is a place/container where all the data is stored. But what is data? In a database, even the smallest piece of information becomes data. For example, the Student is data, the course is data, and Color is data, height, weight, food everything is data. In short, all the living and non-living objects in this world are 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 a 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. The same is done using the database. We would be storing all this 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 in one place – Database.
In a database, we would be grouping only related data together and storing them under one group name called a table. This helps in identifying which data is stored where and under what name. It reduces the time to search for particular data in a whole database. For example, Student, Teacher, Class, Subject, Employee, Department, etc form individual tables.
We store only related data – related to one particular requirement/application. For example, the 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.
It all depends on what database we are developing, and what is the exact requirement/purpose of it. Say, we need to create the College database. What could a college database contain? First thing is that we need to store college information like its name, address. Next comes courses offered in that college, Staff and their details, students and their details. But do we store all this information under one table – College? Will the database be quick in getting the data or updating it? Certainly Not! It would become 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 on 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.
This DBMS tutorial is written to help students understand database concepts.
In the next articles, we will go through the database tutorial (Database Management Tutorial) on various topics.