Find all super keys of r

Assignment Help Database Management System
Reference no: EM131248777

Find the keys:-

Let R(A, B,C, D) be a relation and suppose it contains the following dependencies: A → B, BC → D, and D → A.

(a) Find all super keys of R.

(b) Find all keys of R.

Reference no: EM131248777

Previous Q& A

  Ethical issues of the movie margin call

What are the ethical issues of the movie margin call?

  Create a fun training environment

Tim Trainer is asked to create a fun training environment. The business leader wants the employees to enjoy their working life and make sure that they feel fulfilled and rewarded at the after a training experience -- the key to improved performanc..

  Make a recommendation for one common pto system

Identify any additional information you would need to recommend a solution, and explain where you would likely find that information. Discuss any issues you would likely encounter if you were to merge the PTO system to a traditional leave system...

  Find two examples of businesses in your local community

Find two examples of businesses in your local community that attempt to disclaim liability for damage to or loss of bailed property (usually, the disclaimer is in the form of a sign behind a cash register, or language on a ticket stub.)

  Find scheduling times and total slack for all activities

In the contract, a bonus of $100,000 per day will be paid for each day the project is completed earlier than its expected duration. Evaluate the following alternatives to shorten the project duration and then make a recommendation

  Find the bcnf of clinicplus and compare with bcnf of clinic

Suppose Clinic is augmented to ClinicPlus by the addition of the attribute Appointment, which is unique for every tuple. - This can serve as a primary key. Find the BCNF of ClinicPlus and compare it with the BCNF of Clinic.

  Information systems vulnerable to destruction

Why are information systems vulnerable to destruction, error, and abuse?

  Manage global team communication using technology

Write a 1,050- to 1,400-word paper that describes how you would manage global team communication using technology.

  Provides an introduction to research methods and methedology

In this video, Dr Greg Martin provides an introduction to research methods, methedology and study design. Specifically he takes a look at qualitative and quantitative research methods including case control studies, cohort studies, observational r..

  Show that x is a super key

Find the closure of the set {Instructor, Grade} in School. -  Show that X is a super key if and only if X+ is the set of all attributes of R. Hint! For "if " construct X+ step by step.

Reviews

Write a Review

 

Similar Q& A

  How is the logical-to-physical address mapping accomplished

If we are currently at logical block 10 (the last block accessed was block 10 ) and want to access logical block 4, how many physical blocks must be read from the disk?

  Define calculations and format the table

internship at Mountain View Realty, a real estate firm that focuses in the North Utah County area. The previous intern developed a spreadsheet listing houses listed and sold during the last several months. She included addresses, location, list pr..

  What is the reason for this increased emphasis

Modern relational database management systems have been around for a relatively short period of time.

  What is the role of a dbms

What is the role of a DBMS, and what are it advantages - what are its disadvantages?

  Draw an erd

Draw an ERD for the following problem with attributes, primary keys, cardinalities and participation constraints and specialization, if appropriate

  Explain the architecture of a system for serving up

Draw a diagram of, and explain the architecture of a system for serving up dynamic pages from a database. Show the protocols involved, the flow of messages and what types of information the messages contain.

  Find and display the total owed for all taxpayers

Exit the program (If the user choices 4, the program will exit. If the user chooses 1, 2 or 3, the program will do what the menu item says it will do, and then the menu will appear again.

  What is lan based database management system

What is lan based database management system give an example of lan based database management system with a company name

  What is the purpose of primary key in a database

What is the purpose of primary key in a database?

  Use oracle, list all system privileges assigned to user hr

Use Oracle, list ALL system privileges assigned to user HR. Please show screen shot if you can make it!

  Write the relational schema and draw its dependency diagram

Write the relational schema, draw its dependency diagram, and identify all dependencies, including all partial and transitive dependencies.

  Implement tax calculations within the item class

What's Bothering You? You had good reasons to implement tax calculations within the Item class-it makes much more sense than placing it in the other current classes.

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