Equijoin, Database Management System

When every condition appears with equality condition (=) only. c)  

Natural join (denoted by R*S)

When two join attributes have the similar name in both relations. (That attribute is

Known as Join attribute), only one of the two attributes is retained in the join relation. The join condition in such a case is = for the join attribute. The condition is not given in the natural join.

Posted Date: 3/6/2013 5:53:47 AM | Location : United States







Related Discussions:- Equijoin, Assignment Help, Ask Question on Equijoin, Get Answer, Expert's Help, Equijoin Discussions

Write discussion on Equijoin
Your posts are moderated
Related Questions
Design a gennalization and specialization hierarchy for an automobile sales company

Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT

Mention various steps required to draw an E-R Diagram. Draw an E-R Diagram for Student Information System. Mention all suitable assumptions to justify your answer.

What is object containment? References among objects can be used to model dissimilar real-world concepts.

Define the terms entity, attribute, role and relationship between the entities, giving examples for each of them.         Ans: Entity:   An entity is a "thing" or "object" in th

Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u

Describe the statement in SQL which allows to change the definition of a table? In SQL Alter statement is used to allow the changes the definition of a table.

Update Operations and Dealing with Constraint Violations There are three basic operations to be executes on relations: Insertion Deletion Update The INSER

Which of the operations constitute a basic set of operations for manipulating relational data? Relational algebra operations constitute a basic set of operations for manipulati

Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--