Illustrate the cardinality of relationship, Database Management System

Assignment Help:

Cardinality of Relationship

One-to-One

Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher is teaching only one learner.

One-to-Many

Only one entity of the first set is related to many entities of the second set. E.g. A teacher teaches learners.

Many-to-One

Multiple entities of the first set are related to many entities of the second set. E.g. Teachers teach a learner.

Many-to-Many

Multiple entities of the first set are related to multiple entities of the second set. E.g. Teachers teach learners

 


Related Discussions:- Illustrate the cardinality of relationship

What is the difference between link and reference, What is the difference b...

What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only

Explain the deadlock avoidance, Define deadlock avoidance. An alternat...

Define deadlock avoidance. An alternative method for avoiding deadlocks is to needs additional information about how resources are to be requested. Each request requires the s

Self-join, Self-Join:   In a self join a table is joined with itself.  Let ...

Self-Join:   In a self join a table is joined with itself.  Let consider the following sample partial data of EMP table EMPNO ENAME MGRID

Define clause in sql to specify query result must be sorted, The clause in ...

The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by

Describe substring comparison in sql, Describe substring comparison in SQL....

Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address co

What is the difference between primary key and a unique key, What's the dif...

What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim

Dbms, statical data

statical data

Explain the paths in the association network, Explain the paths in the asso...

Explain the paths in the association network We can analyze use of paths in the association network as given below: Calculate each operation Find associations whic

Having clause with sub queries, Having Clause with sub queries: First we h...

Having Clause with sub queries: First we have to recollect the GROUP BYclause. The following query searches the minimum salary in every department. SELECT DEPTNO, MIN (SAL)

Give the levels of data abstraction, Give the levels of data abstraction? ...

Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level

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