User Account

All Pages

Represent a relational algebra expression

Assignment Help Basic Computer Science
Reference no: EM131153954

How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied.

Reference no: EM131153954

Questions Cloud

Set of ordered pairs : Write, as a set of ordered pairs, a function f that is a bijection from V1 to V2, satisfying the following condition: if x and y are elements in V1 such that {x,y} is in E1, then f(x) and f(y) are elements in V2 such that {f(x),f(y)} is in E2, and..
Most of what is written about leadership : Most of what is written about leadership has been written by western scholars and practitioners—mostly from the United States. Thus, what we have studied in this module so far reflects western assumptions and values about how to improve leadership pe..
Draw a block diagram of how this device might work : Based on this brief description of the Head Master, draw a block diagram of how this device might work and the basic components that might be needed in the Head Master. Include in your block diagram the ultrasonic signal source, detectors, timers,..
Calculate the es ef ls and lf times and the slack : Calculate the ES, EF, LS, and LF times and the slack for each activity- identify the critical path for the project.- an the project be completed in 40 weeks?
Represent a relational algebra expression : How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied.
Develop conclusions about the economys influence : Develop conclusions about the economy's influence on personal and business decision making such as purchases, investments, and so forth.
Role and relationship between the entities : Define the terms entity, attribute, role and relationship between the entities, giving examples for each of them.
What is required procedure when agency issues new rule : According to Alexander Hamilton in Federalist No. 78, the power of judicial review. To the extent that independent agencies (such as the Environmental Protection Agency) are under anyone's control, they are under the control of. What is the required ..
Restrictions that are applied on the modification : List two restrictions that are applied on the modification (updation, insertion or deletion) of base tables through view. With the help of examples, explain why those restrictions are required.

Reviews

Write a Review

Basic Computer Science Questions & Answers

  The network administrator of lenix ventures

The network administrator of Lenix Ventures

  Describe the graphical coordinate system in java

Describe the graphical coordinate system in Java. Where is the origin? What units apply to the x,y coordinates.

  Write a script that creates and calls a stored procedure

Write a script that creates and calls a stored procedure named spInsertProduct that inserts a row into the Products table. This stored procedure should accept five parameters. One parameter for each of these columns

  Determine the force p needed to raise the column

. The contacting surface between A and D is smooth.

  Know how to process command line arguments

Through this programming assignment, the students will learn to do the following: Know how to process command line arguments. Perform basic file I/O.

  Would this approach be a better use of computer time

Would this approach be a better use of computer time? Defend your answer.

  Explain how has science enhanced quality of life

Explain typical day in your life from time you wake up, until time you go to bed. Explain how science influences you and your routine throughout the day.

  Distinguish among vulnerability-threat and control

Distinguish among vulnerability, threat, and control. Describe two examples of vulnerabilities in automobiles for which auto manufacturers have instituted controls. Tell why you think these controls are effective, somewhat effective, or ineffective..

  Draw a timeline showing possible sequence of transmissions

Draw a timeline showing one possible sequence of transmissions, attempts, collisions, and exponential back off choices. Your timeline should also meet the following criteria

  Expected release date

Primary Assessment Each student will write a 3-5 page APA formatted paper on how they perceive the final collaboration app including the following minimum information App Name, App Colors, App Theme, Sample Artwork, App Sound,Price, and Expected Rele..

  Review and discuss methods for it manager

Review and discuss methods for IT managers to maintain their skills while gaining new managerial skills

  What constitutes a threat to a network

What is cyber warfare, What is a network and What constitutes a threat to a network?

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!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

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