Example of equijoin, Database Management System

Assignment Help:

Example:

Consider the following relations:

ROLLNO

NAME

ADDRESS

COURSE_ID

100

Kanupriya

234, Saraswati Vihar.

CS1

101

Rajni Bala

120, Vasant Kunj

CS2

102

Arpita Gupta

75, SRM Apartments.

CS4

STUDENT

Course

COURSE ID

COURSE_NAME

DURATION

CS1

CS1

BCA

3yrs

CS2

MCA

3yrs

CS3

M.Sc.

2yrs

CS4

B.Sc.

3yrs

CS5

MBA

2yrs

 

 

 

If we want to show name of all the students with their course details then natural join is used in the following method:

STUDENT     COURSE

Resultant relation will be as follows:

If R2                    R3= R1 ÷ R2                      If R2                       R3= R1 ÷ R2

Student

ROLLNO

NAME

ADDRESS

COURSE_ID

COURSE_NAME

DURATION

100

Kanupriya

234, Saraswati

Vihar.

CS1

BCA

3yrs

101

Rajni Bala

120, Vasant Kunj

CS2

MCA

3yrs

102

Arpita

Gupta

75, SRM

Apartments.

CS4

B.Sc.

3yrs

 

 

 

 

 

There are some other types of joins like outer joins.


Related Discussions:- Example of equijoin

Backup - restore utilities, These are designed to reduce the effects of a d...

These are designed to reduce the effects of a database failure and make sure a database is restored to a consistent state if a failure does arise. Manual backup/restore utilities n

Objectives-transactions and concurrency management, Objectives After Re...

Objectives After Reading this part, you should be able to: Explain the term CONCURRENCY; Describe the term transaction and concurrent transactions; Talk about co

What is a b+-tree index, What is a B+-Tree index? A B+-Tree index takes...

What is a B+-Tree index? A B+-Tree index takes the form of a balanced tree in which each path from the root of the root of the root of the tree to a leaf of the tree is of the

What are temporary tables, What are temporary tables? Temporary tables...

What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.

Create a view that finds the student name, Section A:  Use the following ta...

Section A:  Use the following tables to create a database called College.  Use SQL commands. Student stuid(primary) lastName firstName

Assign, #quesDefine a job scheduling strategy that will meet business requi...

#quesDefine a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pi

Define raid structure, Define raid? Briefly explain it? A range of disk...

Define raid? Briefly explain it? A range of disk organization methods, collectively called redundant arrays of independent disks (RAID) o   Improvement of reliability throug

Creation of indexes, Creation of Indexes Automatically: When a primar...

Creation of Indexes Automatically: When a primary key or Unique constraint is show in a table definition then a unique index is formed automatically. Manually: User can

Atomicity-transaction , Atomicity: It describes a transaction to be a one ...

Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1

The conceptual level or global level in dbms, The Conceptual Level or Globa...

The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd