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

Database individual assignmentdesign a database entity and

Database: Individual Assignment Design a database (entity and relationship tables in Access) for a small college department library. You should have the entities and relationships you need to support: Purchase books Sell ...

Assessment item 1taskthe fermoy house databasethe owners of

Assessment Item 1: Task The Fermoy House database The owners of Fermoy House, a Bed and Breakfast guest house in the Blue Mountains of NSW, have approached you to build them a database to help them run their business. Fe ...

Database design and implementationtask 1 - database

Database Design and Implementation Task 1 - Database Design Your first task is to design a database for the scenario detailed on the following pages. Your final database design should comprise of approximately 10 entitie ...

Database illustrationwritting from scratchdirections be

Database Illustration Writting from scratch. Directions: Be sure to make an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and ...

Assignmentoverviewthis assignment gets you started thinking

Assignment Overview This assignment gets you started thinking like a database designer. You will learn concepts from chapters 1 through 5 and and implement them using MS Access. You should complete the following activiti ...

Your assignment should be submitted in a single word doc

Your assignment should be submitted in a single Word doc (.doc or .docx). It should include your scenario diagram for Problem 1, and your Ruby source code for Problems 2 and 3. Contact me or post to our discussion board ...

Database design and use group assignmentassignment

Database Design and Use Group Assignment Assignment Description - In this assignment you will use your normalized "City Jail" database you have created in your assignment one. You will form a group (2-3 students) and imp ...

Coit20247 database design and development assignmentyou

COIT20247 Database Design and Development Assignment You must use that sample solution of assignment only for the following tasks: Assessment task- 1. Normalization a) Map the ERD, from the sample solution, into a set of ...

Application creating and populating a databasesuppose you

Application: Creating and Populating a Database Suppose you have a small retail store and decide to create a database to track sales. You have information about recent sales that you want to use for testing the database. ...

Itech 1006 - database management systems

ITECH 1006 - Database Management Systems Assignment Overview For this assignment you will implement and query a database from a supplied ER Diagram and Schema. You will be required to write the SQL statements to create t ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate