Let R and K be two relations under a join operation. Assume that m = |R| and n = IKI, then the maximum and minimum sizes of the join, respectively, are: 1. m+n and 0 II. mn and O III. m+n and m-n IV. mn and m+n O III = IV

Let R and K be two relations under a join operation. Assume that m = |R| and n = IKI, then the maximum and minimum sizes of the join, respectively, are: 1. m+n and 0 II. mn and O III. m+n and m-n IV. mn and m+n O III = IV

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

Let $ R $ and $ K $ be two relations under a join operation. Assume that $ m = |R| $ and $ n = |K| $, then the maximum and minimum sizes of the join, respectively, are:

I. $ m+n $ and 0
II. $ mn $ and 0
III. $ m+n $ and $ m-n $
IV. $ mn $ and $ m+n $

- Option I
- Option II
- Option III
- Option IV

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