Explain the cartesian product, Database Management System

Assignment Help:

Explain the Cartesian product: 

The Cartesian product operation does not need relations to union-compatible.  The meaning of this is that the involved relations may have dissimilar schemas.  Let R & S be relations that may have dissimilar schemas. 

 DEF: Cartesian product

 The Cartesian product of relations R and S, denoted R X S, is the set of all probable combinations of tuples of the two operation relations.  Every resultant tuple contains all the attributes of R and S. 

The resultant relation has  

 Cardinality = (cardinality of R) * (cardinality of S); and 

 arity = (arity of R)  +  (arity of S). 

 For instance, in given table, STUDENT X MODULE is equal to

1560_Cartesian Product.png


Related Discussions:- Explain the cartesian product

What do you mean through integrity constraints, What do you mean through in...

What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which

Explain the object-oriented decomposition, Explain the Object-oriented deco...

Explain the Object-oriented decomposition Object-oriented decomposition targets at identifying individual sovereign objects that encapsulate both a state and certain behavio

What is E-R model, E-R Model This data model is based on real world th...

E-R Model This data model is based on real world that consists of basic objects named entities and of relationship among these objects. Entities are illustrated in a database

What is primary key, What is Primary key? Primary Key - Primary key i...

What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.

Read-set(t) and timestamps-optimistic concurrency contents, read-set(T) : E...

read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.

Mobile database, write short note on mobile database

write short note on mobile database

How is the database organised in oracle, How is the database organised in O...

How is the database organised in Oracle? Database organized within Oracle in terms of table and table holds attributes and values. A database consists of one or more logical

What are the problems in database normalization, What are the problems if o...

What are the problems if one were not to normalize?  When do these problems surface?           Ans:  Database normalization, sometimes considered to as  canonical synthesis, is

What is bucket overflow and how bucket overflow is handled, What is bucket ...

What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing? Ans: Bucket: unit of storage holding records. Bucket is a disk block

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