Data is distinct useful information. It can be used in a variety of forms like text, numbers, media, bytes, file, pdf etc. generally it is raw and unprocessed. It can be stored in pieces of paper or electronic memory. Word 'Data' is originated from the word 'datum' that means 'single piece of information'. It is plural of the word datum. Data is interchangeable.

In this tutorial, all the topics are covered with in-depth information and can understandable by anyone.

The tutorial is intended for the readers who are interested to learn the SQL as a beginner or the reader who want to increase the level of expertise in SQL.

Users should have database concepts knowledge in addition to computation background can have an advantage of understanding the concepts easily. Users are from non-computation background may need to go through the topic more than once to understand the concept clearly.