1. DATABASE Purpose of database
Database – Database is a collection of related information that is organized in such a way that supports for easy access, modify and maintain data.
Purpose of database
It redues data redundancy
Database can control data inconsistency
It facilitate data sharing
Database enforce standards
Database can ensure data security
Integrity can be maintained through databases

2. DBMS (Database Management System) - The database is managed by some special software packages known as Database Management Systems (DBMS).
The purpose of DBMS software is to allow the user to create, modify and administration of database.

3. RDBMS – Relational Database Management System
Relation - Marks
Primary Key
Relation - Student
Foreign Key ID
NAME
ADDRESS 1
Meenu
Dubai 2
radha
Sharjah 3
Lal
Attribute ID
SUBJECT
MARK 1
MATHS 60 2 70 3 90
ENGLISH 87
Tuple

4. Definitions
Relation(table) - Data arranged in rows and columns Tuple (record) – Row of a relation Attribute (field) – Column of a relation Cardinality of a relation – Number of tuples in a relation Degree of a relation – Number of columns in a relation Primary key – Set of one or more attribute that can uniquely identify the tuples within a relation. Foreign key – Non key attribute which is the primary key of another table Candidate key – Attribute that can serve as primary key Alternate key – Candidate key which is not a primary key

5. SQL (Structured Query Language) is a standard language for accessing and manipulating databases

6. SQL (Structured Query Language)
DDL (Data Definition Language)
DML (Data ManipulationLanguage)

7. SQL (Structured Query Language)
DDL
DML
Data Definition Language (DDL) or Data Description Language (DDL) statements are used to define different structures in a database.
DDL statements are used to create structure of a table, modify the existing structure of the table and remove the existing table
Data Manipulation Language (DML) statements are used to insert data into tables, delete data from the tables, retrieve data and modify the existing data.
Create table ->to create table
Alter table->to modify table
Drop table ->to delete table
Insert->to insert values in a table
Update ->to modify data
Delete ->to delete data
Select ->to get the data from table