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Worksheet for Class 12 Informatics Practices Database Fundamentals MySQL Tour
Class 12 Informatics Practices students should refer to the following printable worksheet in Pdf for Database Fundamentals MySQL Tour in Class 12. This test paper with questions and answers for Class 12 will be very useful for exams and help you to score good marks
Class 12 Informatics Practices Worksheet for Database Fundamentals MySQL Tour
CBSE Class 12 Informatics Practices Database Fundamentals Mysql Revision Tour. Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
UNIT 3
CHAPTER 13: DATABASE FUNDAMENTALS - MYSQL REVISION TOUR
Database: Collection of logically related data stored in a structure format.
DBMS: Software used to manage databases is called Data Base Management System (DBMS).
RDBMS: A DBMS used to manage Relational Databases is called an RDBMS (Relational Data
Base Management System). Some popular RDBMS software available are: Oracle, MySQL,
Sybase, and Ingress.
Benefits of using a DBMS are:
a. Redundancy can be controlled b. Inconsistency can be avoided
c. Data can be shared d. Security restrictions can be applied.
MySQL: It is an Open Source RDBMS Software. It is available free of cost.
Relation/Table: A table refers to a two dimensional representation of data arranged in columns
(also called fields or attributes) and rows (also called records or tuples).
Key: A column or a combination of columns which have some specific characteristics in a relation
e.g. are Primary Key, Candidate Key and Foreign Key etc.
Primary Key: The group of one or more attribute(s) used to uniquely identify each row/tuple of a
relation/table is called its Primary Key.
Candidate Key: A group of columns which can be set as the primary key of a relation is called a
candidate key because it is one of the candidates available to be the primary key of the relation.
Alternate Key: A candidate key of a table which is not set as primary key is called its Alternate Key.
Degree is the number of columns/attributes in the table.
Cardinality is the number of rows/tuples in a table.
SQL (Structured Query Language): It is the language used to manipulate and manage databases
and tables within them using an RDBMS. There are following four types of SQL commands:
1. DDL (Data Definition Language): Deals with the Structure (create, remove, or modify) of
databases and tables e.g. CREATE, DROP, ALTER.
2. DML (Data Manipulation Language): Used to manipulate data/ values within tables e.g.
INSERT, UPDATE, DELETE.
3. DCL (Data Control Language): Used to control the access to the databases and tables e.g.
GRANT, REVOKE.
4. TCL(Transaction Control Language): used to manage and control the transaction e.g.
COMMIT , ROLLBACK, SAVEPOINT
Some Commonly used DDL Command are as follows:-
SNo Command, Syntax and Purpose
1 Command : Create Database
Syntax: Create database
Purpose: Creates a database with specified name
2 Command : Create Table
Syntax: Create Table
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CBSE Class 12 Informatics Practices Database Fundamentals MySQL Tour Worksheet
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Worksheet for Informatics Practices CBSE Class 12 Database Fundamentals MySQL Tour
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Database Fundamentals MySQL Tour worksheet Informatics Practices CBSE Class 12
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Database Fundamentals MySQL Tour CBSE Class 12 Informatics Practices Worksheet
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Worksheet for CBSE Informatics Practices Class 12 Database Fundamentals MySQL Tour
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