Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask DBMS Expert


Home >> DBMS

problem 1)a) What is data abstraction? Describe the levels of data abstraction.

(b) Consider the following relational database and give an expression in the relational algebra for each of the following queries:
employee( person_name, street, city)
works (person_name, company_name, salary)
company (company_name, city)
manages (person_name, manager_name)

(i) Find the company with the most employees.

(ii) find the company with smallest payroll.

(iii) Find the names and cities of residence of all employees who work for First bank corporation.

(iv) Give all managers in the database a 10 percent salary raise, unless the salary would be greater than Rs. 100,000. In such cases give only a 3 percent raise.

(c) Describe the different outer join operations with ex.

problem 2)(a) Describe the test for empty relations in nested queries.

(b) Use following schema and prepare the queries:

Employee(Fname, Initial, Lname, ENo, DOB, Addr, Sex, Salary, SENo, DNo)
Department(DNmae, DNo, MgrENo, MgrStDt,)
Dept_Location(DNo, DLocation)
Project(PName, PNo, PLocation, DNo)
Work_on(ENo, PNo, Hours)
Dependent(ENo, Dep_Name, Sex, DOB, Rel)

i) Give all employees in the research dept a 10% salary raise.

ii) Retrieve the name of employees who have no dependents (use exists/not exists).

iii) For each project retrieve the project number, project name, number of employees from department 5 who work on the project.

iv) Retrieve a list of employees and the projects they are working on, order by dept and within dept alphabetically by last name and first name.

(c) Describe the update of a view.

(d) Describe view serializability with ex.

problem 3)(a) What are attributes? Describe various types of attributes with ex. How they are represented in an ERD.

(b) Consider the University database application with following details:

• An University has many departments.

• Each department has multiple instructors; one among them is head of department.

• An instructor belongs to only one department.

• Each department offers multiple courses, each of which is taught by a single instructor.

• A student may enroll for many courses offered by different departments.

Draw the ERD for the above by identifying entities, relationships, attributes and cardinality.

(c) Describe the concept of recoverable and cascade less schedules.

DBMS, Programming

  • Category:- DBMS
  • Reference No.:- M96561

Have any Question? 


Related Questions in DBMS

Query 1list all movies played in landmark or music box

Query 1 List all movies played in Landmark or Music Box. Output only titles and eliminate duplicates. Query 2 List all stars born after 1960. Order them by their birthdate in ascending order. Output their first names, la ...

Assignment advanced relational databaseproject- advance

Assignment: Advanced Relational Database PROJECT- Advance SQL Overview: Using the knowledge garnered thus far, please solve all of the below problems. Please run the attached SQL script file at the SQL*PLUS prompt. This ...

Homeworkgiven the relations below answer the following

HOMEWORK Given the relations below, answer the following queries using SQL. Note that the tables contain sample records only and do not represent all the possible records that could be stored in these tables. MEMB ERS ME ...

Assignmentdeliverablesall files are located in the

Assignment Deliverables All files are located in the subdirectory of the project. The project should function as specified: When you visit the Personnel form page (frmPersonnel.aspx), a record should be saved in the tblU ...

Data warehouses and data martswrite a one- to two-page

Data Warehouses and Data Marts Write a one- to two-page (250-500 word) paper that discusses the differences between data warehouses and data marts. Also, discuss how organizations can use data warehouses and data marts t ...

The use of an access database has become very common over

The use of an Access database has become very common over the last 10 years. Access is the preferred desktop database because server databases such as structured query language (SQL) and others are too complex and are be ...

Discussionatleast 1 paragraph for each partpart 1 remote

Discussion Atleast 1 paragraph for each part Part 1: "Remote Access" Please respond to the following: • Remote access to corporate resources is becoming commonplace. From an auditing perspective, suggest two or more cont ...

Frontlines united states of secrets all Frontline's United States of Secrets, all

Frontline's United States of Secrets, all episodes: http://www.pbs.org/wgbh/frontline/film/united-states-of-secrets/ (Links to an external site.) Nova's Genome specials http://www.pbs.org/wgbh/nova/body/cracking-the-code ...

Objective this is an individual assignment aimed to give

Objective: This is an individual assignment aimed to give the student exposure to the concepts relating to database systems and optimal strategies for efficient management of databases Learning Outcomes assessed: 1. Crea ...

Individual outsourcing risksprepare a 8- to 10-slide

Individual: Outsourcing Risks Prepare a 8- to 10-slide PowerPoint presentation, including speaker notes, that identifies the possible risks to an organization in each of the following outsourcing situations: • The use of ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro