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DBMS/DataBase Notes and Interview Question

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LEC-1: Introduction to DBMS
1. What is Data?
a. Data is a collection of raw, unorganized facts and details like text, observations, figures, symbols,
and descriptions of things etc.
In other words,
data does not carry any specific purpose and has no significance by itself.
Moreover, data is measured in terms of bits and bytes – which are basic units of information in the
context of computer storage and processing.
b. Data can be recorded and doesn’t have any meaning unless processed.
2. Types of Data
a. Quantitative
i. Numerical form
ii. Weight, volume, cost of an item.
b. Qualitative
i. Descriptive, but not numerical.
ii. Name, gender, hair color of a person.
3. What is
a. Info. Is processed, organized, and structured data.
b. It provides context of the data and enables decision making.
c. Processed data that make sense to us.
d. Information is extracted from the data, by
analyzing and interpreting pieces of data.
e. E.g., you have data of all the people living in your locality, its Data, when you analyze and interpret
the data and come to some conclusion that:
i. There are 100 senior citizens.
ii. The sex ratio is 1.1.
iii. Newborn babies are 100.
These are information.
4. Data vs Information
a. Data is a collection of facts, while information puts those facts into context.
b. While data is raw and unorganized, information is organized.
c. Data points are individual and sometimes unrelated. Information maps out that data to provide a
big-picture view of how it all fits together.
d. Data, on its own, is meaningless. When it’s analyzed and interpreted, it becomes meaningful
e. Data does not depend on information; however, information depends on data.
f. Data typically comes in the form of graphs, numbers, figures, or statistics. Information is typically
presented through words, language, thoughts, and ideas.
g. Data isn’t sufficient for
decision-making, but you can make decisions based on information.
5. What is
a. Database is an electronic place/system where data is stored in a way that it can be
easily accessed,
managed, and updated.
b. To make real use Data, we need Database management systems. (DBMS)
6. What is DBMS?
a. A database-management system (DBMS) is a collection of
interrelated data and a set of
programs to access those data
. The collection of data, usually referred to as the database,
contains information relevant to an enterprise. The primary goal of a DBMS is to provide a way to
store and retrieve database information that is both convenient and efficient.
b. A DBMS is the database itself, along with all the software and functionality. It is used to perform
different operations, like
addition, access, updating, and deletion of the data


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  1. Where is the link to download the entire pdf at once ?

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  2. now the playlist is over kindly upload the notes

  3. combined pdf link is not working


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