DBMS Basics

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 Data Base Management System-

DataBase - DataBase is the collection of Entities. 

Entity - Entity is the collection of Records. 

Record - It is the information that a user possess [like name="Chitransh" , roll=101, age= 21 this is an information is called record] 

Tuple - It is the complete record of any user. 

Note:- Incomplete information will come under RECORD category but TUPLE can not be incomplete. 

Field - It is representing the information(like roll, name, age) 

Key - It is a special type of field with is used to identify/ manage the complete record. 

Types of Keys-  

1. Primary Key.  

Properties- 

a) Unique(No repeat) 

b) No Blank(Not Null)

2. Unique Key. 

Properties-

a) Unique(No repeat) 

b) Blank(null) 

3. Foreign Key (Referential Key)

1. It is used in Normalization.

2. Normalization is the process of reducing the complexity by dividing the master table into numerous small tables.

3. The common primary key in all the tables is called as Foreign key. 

What is DBMS? 

DBMS is managing the complete information for managing, it uses a special type of command known as Query. 

Query- It is Predefined operation performed in data base record. 

Two types of Queries- 

1. Executed Non Query(its operations reflected to the database)

a) insert

b) update

c) delete

2. Executed Query( It is used to display the records) 

Select query is used. 










   

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